There are 4 easy steps to find the molar mass of SO2 + H2 based on its chemical formula. 1. Count The Number of Each Atom. The first step to finding the molar mass is to count the number of each atom present in a single molecule using the chemical formula, SO2 + H2: 2. Find Atomic Mass of Each Element.3. Compute Mass of Each Element. Multiply the number of atoms by the atomic weight of each element found in steps 1 and 2 to get the mass of each element in H2SO4: Molar Mass (g/mol) H (Hydrogen) 2 × 1.00794 = 2.01588. S (Sulphur/Sulfur) 1 …Jan 18, 2024 · mole = mass / molecular weight (multiply both sides by molecular weight) mole × molecular weight = mass (rearrange the equation) mass = molecular weight × mole. As 1.626×10 23 molecules of NaOH is also equal to 0.27 moles, and we know that the molecular weight of NaOH is 40, we can use these numbers to get: mass = 40 × 0.27 = 10.8 g. H2, molar mass = 2.016 C3H6 + H2 + C3Hg Assuming 6.00 g of propene and 16.00 g of hydrogen are used, answer the following questions: Part: 0 / 6 can be prepared by the reaction of propene according to the following balanced equation: C3H8, molar mass = 44.09 g mol g mo1Examples of molecular weight computations: C[14]O[16]2, S[34]O[16]2. Definitions of molecular mass, molecular weight, molar mass and molar weight. Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). (1 u is equal to 1/12 the mass of one atom of carbon-12)The stable isotope of hydrogen with relative atomic mass 1.007825 and a natural abundance of 99.9885 atom percent (from Greek pirhoomegatauomicronsigma, first ... For example, the molar mass of water (H_2O) can be calculated by adding up the molar masses of two hydrogen atoms and one oxygen atom. The atomic mass of hydrogen is 1.01\text{ amu} , and the atomic mass of oxygen is 16.00\text{ amu} .Jul 22, 2022 · For nitrogen, the mass of the N 2 molecule is simply (14.01 + 14.01) = 28.02 amu. This is referred to as the molecular mass and the molecular mass of any molecule is simply the sum of the atomic masses of all of the elements in that molecule. The molar mass of the N 2 molecule is therefore 28.02 g/mol. For compounds that are not molecular ... Molar mass Molar mass of hydrogen (H2) = 2.0 g/mole Molar mass of water (H2O) = 18.0 g/mole Molar mass of sodium chloride (NaCl) = 58.4 g/mole Molar mass of iron (Fe) = 55.8 g/mole Molar mass is the molecular weight or atomic weight (mass) expressed in gram. 1 mole of any substance = molecular weight in gram Question: Molar mass of …The molar mass of an element is found on the periodic table, and it is the element's atomic weight in grams/mole (g/mol). If the mass of a substance is known, the number of moles in the substance can be calculated. Converting the mass, in grams, of a substance to moles requires a conversion factor of (one mole of substance/molar mass …Hydrogen gas is H2. 1 moles H2 has a molar mass of 2.0158. Thus, 4 moles H2 gas has a mass of2.0158 g/mole x 4 moles = 8.063 g. In a chemical interaction 10 g of hydrogen chloride is added to 20 g ...Prepare a concept map and use the proper conversion factor. Cancel units and calculate. 3.987molAl × 26.98gAl 1molAl = 107.6gAl. 3.987 mol Al × 26.98 g Al 1 mol …Dec 5, 2023 · For example, the molar mass of H2 is 1.007 x 2 x 1 g/mol, or 2.014 g/mol. Finding the molar mass of a compound is a little more complicated. First, you’ll need to find the chemical formula for the compound. For example, if you’re calculating the molar mass of water, you’d start with the formula H2O. Molar Mass, Molecular Weight and Elemental Composition Calculator. Molar mass of N4H2 is 58.04268 ± 0.00094 g/mol. Get control of 2022! Track your food intake, exercise, sleep and meditation for free. Convert between N4H2 weight and moles. Compound.Jan 18, 2024 · Find the molar masses of carbon (C), hydrogen (H), and oxygen (O). Count the number of atoms of each element in the compound. Find the molar mass of glucose by multiplying the atomic masses of the atoms and their number, then find the sum: μ = 6 × 12.01 g/mol + 12 × 1.0079 g/mol + 6 × 16 g/mol = 180.1548 g/mol. Molar Mass, Molecular Weight and Elemental Composition Calculator. Molar mass of H2C2O4*2H2O is 126.0654 g/mol. Get control of 2022! Track your food intake, exercise, sleep and meditation for free. Convert between H2C2O4*2H2O weight and …See full list on webqc.org This program determines the molecular mass of a substance. Enter the molecular formula of the substance. ... There are 4 easy steps to finding the molar mass of (H2)O based on its chemical formula. 1. Count The Number of Each Atom. The first step to finding the molar mass is to count the number of each atom present in a single molecule using ...The molar mass and molecular weight of CO + H2 is 30.026. Instructions. This program determines the molecular mass of a substance. Enter the molecular formula of the substance. The stoichiometric mole ratio of N2 and (3H2) for a maximum theoretical yield is 1:1, which will yield (2NH3) in a ratio of 1. If you combine 28.013 g (or 1 moles) of N2 (molar mass = 28.013 g/mol) and 6.048 g (or 1 moles) of (3H2) (molar mass = 6.048 g/mol) it will have a theoretical maximum yield of 34.061 g ( 1 moles) of (2NH3) (molar mass ...Hydrogen. Formula: H 2. Molecular weight: 2.01588. IUPAC Standard InChI: InChI=1S/H2/h1H. Copy Sheet of paper on top of another sheet. IUPAC Standard InChIKey: UFHFLCQGNIYNRP-UHFFFAOYSA-N. Copy Sheet of paper on top of another sheet. CAS Registry Number: 1333-74-0. The molar mass of gold is 196.97 g/mol. To find this number, multiply the atomic mass by the molar mass constant, which is one gram per one mole because gold in its elemental form ...Nov 1, 2023 · Multiply the number of moles by the molar mass to obtain the mass. Let’s work through an example to illustrate this process. Worked out Example: Finding Mass from Moles and Molar Mass. Suppose we have 2.5 moles of hydrogen gas (H2). The molar mass of H2 is 2.02 g/mol. To find the mass of hydrogen gas, we can use the following formula:M N−1. In chemistry, the molar mass ( M) of a chemical compound is defined as the ratio between the mass and the amount of substance (measured in moles) of any sample of said compound. [1] The molar mass is a bulk, not molecular, property of a substance. The molar mass is an average of many instances of the compound, which often vary in mass ... Solution: The molar mass of molecules of those elements is equal to the molar mass of the atoms multiplied by the number of atoms in each molecule. Therefore, Molar Mass of …Molar mass calculator computes molar mass, molecular weight and elemental composition of any given compound. ... Molar mass of H2 is 2.01588 ± 0.00014 g/mol Relative atomic mass: 1.008 State at 20°C: Gas Key isotopes 1 H, 2 H Electron configuration 1s 1 CAS number: 133-74-0 ChemSpider ID: 4515072The molar mass and molecular weight of H2(CO3) (Carbonic Acid) is 62.025. ... The first step to finding the molar mass of Carbonic Acid is to count the number of each ... Examples of molecular weight computations: C[14]O[16]2, S[34]O[16]2. Definitions of molecular mass, molecular weight, molar mass and molar weight. Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). (1 u is equal to 1/12 the mass of one atom of carbon-12)Jan 1, 2021 ... Solution For Calculate the molecular masses of H2,O2,Cl2,CO2,CH4,C2H6′To calculate the stoichiometry of N2 + (3H2) = (2NH3) you must balance the equation to find the stoichiometric mole ratio of each compound. The equation can be balanced using the chemical equation balancer.The stoichiometry calculator above shows the mole ratios/coefficients of the balanced equation, N 2 + (3H 2) = (2NH 3).Enter the amount of …Molar mass of a substance is the mass in grams of one mole of the compound. In a substance, the amount of entities present e.g. atoms, molecules, ions, is defined as a mole. A mole of any substance is 6.022×1023 molecules. Just as we take a standard value to calculate different things e.g. 1 dozen =12 items similarly we use the mole to ...Jun 15, 2020 ... Calculate the molar mass of each of the following compounds: (a) hydrogen fluoride, HF (b) ammonia, NH3 (c) nitric acid, HNO3 (d) silver ...The density of h2 is 0.0899 g/L, which is at the standard temperature and pressure or STP. Since gases like hydrogen, all occupy the same volume on a per-mile basis, the density of a particular gas is dependent on its molar mass. The density of hydrogen is directly proportional to the temperature and inversely proportional to the …Molar mass is the sum of the masses of all the individual atoms present in a molecule or compound; The atomic mass of Nitrogen N is 14u. The atomic mass of hydrogen H is 1u. The atomic mass of Oxygen is 16u. The atomic mass of carbon is 12u. The atomic mass of chlorine is 35.5u. Molecular mass of H 2 = 2 x Atomic mass of hydrogen = 2 x 1 = 2 g ...Calculate the molar mass of C2H2 in grams per mole or search for a chemical formula or substance. Molecular weight of C2H2. C2H2 molecular weight. Molar mass of C2H2 = 26.03728 g/mol. This compound is also known as Acetylene. Convert grams C2H2 to moles. or. moles C2H2 to grams.One mole of any substance has a mass equal to its atomic or molecular weight in grams. For example, one mole of carbon-12 atoms weighs 12 grams, while one mole of water (H2O) molecules weighs 18 grams (2 hydrogen atoms weigh 1 gram each, and 1 oxygen atom weighs 16 grams). This relationship between moles and mass is known as the …AboutTranscript. One mole of a substance is equal to 6.022 × 10²³ units of that substance (such as atoms, molecules, or ions). The number 6.022 × 10²³ is known as Avogadro's number or Avogadro's constant. The concept of the mole can be used to convert between mass and number of particles.. Created by Sal Khan.Examples of molecular weight computations: C[14]O[16]2, S[34]O[16]2. Definitions of molecular mass, molecular weight, molar mass and molar weight. Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). (1 u is equal to 1/12 the mass of one atom of carbon-12)Enter a chemical formula to calculate the molar mass of a substance. For hydrogen, the formula is H2 and the molar mass is 2 grams per mole.Molar Mass, Molecular Weight and Elemental Composition Calculator. Molar mass of H2C2O4*2H2O is 126.0654 g/mol. Get control of 2022! Track your food intake, exercise, sleep and meditation for free. Convert between H2C2O4*2H2O weight and moles. Compound. Multiply the number of atoms by the atomic weight of each element found in steps 1 and 2 to get the mass of each element in NH3: Molar Mass (g/mol) N (Nitrogen) 1 × 14.0067 = 14.0067. H (Hydrogen) 3 × 1.00794 = 3.02382. 4. Sum Each Element's Mass. Finally, add together the total mass of each element to get the molar mass of NH3: There are 4 easy steps to find the molar mass of H2(CO3) based on its chemical formula. 1. Count The Number of Each Atom. The first step to finding the molar mass of Carbonic Acid is to count the number of each atom present in a single molecule using the chemical formula, H2(CO3): Element Number of Atoms;Molar Mass, Molecular Weight and Elemental Composition Calculator. Molar mass of Hydrogen (H 2) is 2.01588 ± 0.00014 g/mol. Get control of 2022! Track your food intake, exercise, sleep and meditation for free. Convert between H2 weight and moles. Compound. Examples of molecular weight computations: C[14]O[16]2, S[34]O[16]2. Definitions of molecular mass, molecular weight, molar mass and molar weight. Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). (1 u is equal to 1/12 the mass of one atom of carbon-12)Jan 18, 2024 · Find the molar masses of carbon (C), hydrogen (H), and oxygen (O). Count the number of atoms of each element in the compound. Find the molar mass of glucose by multiplying the atomic masses of the atoms and their number, then find the sum: μ = 6 × 12.01 g/mol + 12 × 1.0079 g/mol + 6 × 16 g/mol = 180.1548 g/mol. The molar mass and molecular weight of H2{+} is 2.015. Instructions. This program determines the molecular mass of a substance. Enter the molecular formula of the substance. Find the molar masses of carbon (C), hydrogen (H), and oxygen (O). Count the number of atoms of each element in the compound. Find the molar mass of glucose by multiplying the atomic masses of the atoms and their number, then find the sum: μ = 6 × 12.01 g/mol + 12 × 1.0079 g/mol + 6 × 16 g/mol = 180.1548 g/mol.Hydrogen molecule (H2 - Molecular mass), molar mass. Type the number of Hydrogen molecule (H2) you want to convert in the text box, to see the results in the table. 1 H2. is equal to. 2.02 g/mol. Jul 16, 2017 · Wikipedia has "vapour density = molar mass of gas / molar mass of H2", and I'm not sure whether a mixture has a defined molar mass. The same source states that vapour density is sometimes based on the density of air rather than dihydrogen gas (to assess whether certain gases collect on the floor or ceiling of a room when released). …Oct 16, 2023 ... The molecular mass of H2 is 2.0159 g/mol. This means 2.0159 grams of H2 are present per mole. ... Thus, the mass of 2 mol of H2 is 4.03 g.Jan 1, 2021 ... Solution For Calculate the molecular masses of H2,O2,Cl2,CO2,CH4,C2H6′Molar mass (molar weight) is the mass of one mole of a substance and is expressed in g/mol. Mole is a standard scientific unit for measuring large quantities of very small entities such as atoms and molecules. One mole contains exactly 6.022 ×10 23 particles (Avogadro's number) Steps to calculate molar massFinally, add together the total mass of each element to get the molar mass of CO + H2: 12.0107 g/mol + 15.9994 g/mol + 2.01588 g/mol = 30.02598 g/mol. 5. Find Mole Fraction. To find the mole fraction and percentage of each element in CO + H2, divide each total from step 3 by the total molar mass found in step 4:The calculator below can be used to estimate the density and specific weight of gaseous hydrogen at given temperature and atmospheric pressure (1 bara/14.5psia). The output density is given as kg/m 3 , lb/ft 3 , lb/gal (US liq) and sl/ft 3 . Specific weight is given as N/m 3 and lb f / ft 3 . Temperature.H (Hydrogen) 1.00794. 3. Compute Mass of Each Element. Multiply the number of atoms by the atomic weight of each element found in steps 1 and 2 to get the mass of each element in 3H2: Molar Mass (g/mol) H (Hydrogen) 6 × 1.00794 = 6.04764. 4. Sep 1, 2023 ... molar mass of H2CO3 (carbonic acid) l carbonic acid formula l h2co3 molecular weight l · Comments8.There are two videos that need to be reposted every time a mass shooting happens. AFTER ORLANDO’S MASS SHOOTING THIS WEEKEND I noticed an interesting trend on my feeds: people were...Ca + 2 H20 - Ca(OH)2 + H2 Ca H20 H₂ Ca(OH)2 Saved Question 6 (2 points) For the reaction: N2 + 3H2 → 2NH3. Which of the following is the limiting reactant if 78 g of N2 and 26 g of H2 are combined? Molar mass of H2 is 2.016 g/mol and Molar mass of N2 is 28.02 g/mol N2 H₂ NH3Molar Mass, Molecular Weight and Elemental Composition Calculator. Molar mass of H2C2O4*2H2O is 126.0654 g/mol. Get control of 2022! Track your food intake, exercise, sleep and meditation for free. Convert between H2C2O4*2H2O weight and …Molecular mass of hydrogen ( H2) is ___ u. Q. Calculate the molecular masses of H2,O2,CO2,NH3. Q. Calculate the molecular mass (u) of Sulphuric acid ( H2SO4 ). Q. …Word Equation. Aluminium + Hydrogen Chloride = Aluminum Chloride + Dihydrogen. Al + HCl = AlCl3 + H2 is a Single Displacement (Substitution) reaction where two moles of solid Aluminium [Al] and six moles of aqueous Hydrogen Chloride [HCl] react to form two moles of aqueous Aluminum Chloride [AlCl 3] and three moles of Dihydrogen [H 2] gas. Show ... Multiply the number of atoms by the atomic weight of each element found in steps 1 and 2 to get the mass of each element in H: Molar Mass (g/mol) H (Hydrogen) 1 × 1.00794 = 1.00794. 4. Sum Each Element's Mass. Finally, add together the total mass of each element to get the molar mass of H: Learn about the molecular formula, molar mass, structure, properties and uses of hydrogen gas (H2), the non-metal with the symbol H. Find out how hydrogen gas is produced from water and other sources, and how it is …Multiply the number of atoms by the atomic weight of each element found in steps 1 and 2 to get the mass of each element in H: Molar Mass (g/mol) H (Hydrogen) 1 × 1.00794 = 1.00794. 4. Sum Each Element's Mass. Finally, add together the total mass of each element to get the molar mass of H: The stable isotope of hydrogen with relative atomic mass 1.007825 and a natural abundance of 99.9885 atom percent (from Greek pirhoomegatauomicronsigma, first ... Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance. Finding molar mass starts with units of grams per mole (g/mol). When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance.Hydrogen. Formula: H 2. Molecular weight: 2.01588. IUPAC Standard InChI: InChI=1S/H2/h1H. Copy Sheet of paper on top of another sheet. IUPAC Standard InChIKey: UFHFLCQGNIYNRP-UHFFFAOYSA-N. Copy Sheet of paper on top of another sheet. CAS Registry Number: 1333-74-0. Chemical structure:Nov 24, 2020 ... Q.1 Calculate the molecular masses of H2, O2, Cl2, C02, CH4, C2H6, C2H4, NH3, CH30H. Atoms and molecules class 9 intext solution playlist ...If you do any cooking or baking, sometimes you'll need to know how many cups of flour are in a pound, or how many sticks of butter will get you a cup. This simple mass-to-volume co...hydrogen H2, molar mass = 2.016 C3H60 + H2 C3H7OH Assuming 10.50 g of acetone and 20.50 g of hydrogen are used, answer the following questions: Part: 0 / 6 Rubbing alcohol, or isopropanol ( C3H7OH, molar mass = 60.09 g - according to the following balanced equation: mol , can be prepared by the reaction of acetone C3H6O, molar mass = 58.08 …Molar Mass, Molecular Weight and Elemental Composition Calculator. Molar mass of Hydrogen (H 2) is 2.01588 ± 0.00014 g/mol. Get control of 2022! Track your food intake, exercise, sleep and meditation for free. Convert between H2 weight and moles. Compound. Examples of molecular weight computations: C[14]O[16]2, S[34]O[16]2. Definitions of molecular mass, molecular weight, molar mass and molar weight. Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). (1 u is equal to 1/12 the mass of one atom of carbon-12)Learn about the molecular formula, molar mass, structure, properties and uses of hydrogen gas (H2), the non-metal with the symbol H. Find out how hydrogen gas is produced from water and other sources, and how it is …The molar mass and molecular weight of H2(O2) (Hydrogen Peroxide) is 34.015. Dec 9, 2022 ... 35.7 g HCl × 1mol HCl / 36.458g/mol = 0.9792 mol HCl. Note that the molar mass of Hydrogen is 1.008, but since it's a Dihydrogen molecule, the ...Finally, add together the total mass of each element to get the molar mass of H2{-}: 2.01588 g/mol + 0.000548579909 g/mol = 2.016428579909 g/mol. 5. Find Mole Fraction. To find the mole fraction and percentage of each element in H2{-}, divide each total from step 3 by the total molar mass found in step 4:The molar mass and molecular weight of H2{+} is 2.015. Instructions. This program determines the molecular mass of a substance. Enter the molecular formula of the substance. Examples of molecular weight computations: C[14]O[16]2, S[34]O[16]2. Definitions of molecular mass, molecular weight, molar mass and molar weight. Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). (1 u is equal to 1/12 the mass of one atom of carbon-12)In contrast, rubber balloons filled with air tend to retain their shape and volume for a much longer time. Because helium has a molar mass of 4.00 g/mol, whereas air has an average molar mass of about 29 g/mol, pure helium effuses through the microscopic pores in the rubber balloon \(\sqrt{\frac{29}{4.00}}=2.7\) times faster than air.Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance. Finding molar mass starts with units of grams per mole (g/mol). When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance.Jan 1, 2021 ... Solution For Calculate the molecular masses of H2,O2,Cl2,CO2,CH4,C2H6′There are 4 easy steps to finding the molar mass of C2 (H2) based on its chemical formula. 1. Count The Number of Each Atom. The first step to finding the molar mass is to count the number of each atom present in a single molecule using the chemical formula, C2 (H2): (Carbon) (Hydrogen) 2.The molar mass and molecular weight of CO + H2 is 30.026. Instructions. This program determines the molecular mass of a substance. Enter the molecular formula of the substance. H (Hydrogen) 1.00794. 3. Compute Mass of Each Element. Multiply the number of atoms by the atomic weight of each element found in steps 1 and 2 to get the mass of each element in 3H2: Molar Mass (g/mol) H (Hydrogen) 6 × 1.00794 = 6.04764. 4.
The molar mass of an element (or compound) is the mass in grams of 1 mole of that substance, a property expressed in units of grams per mole (g/mol) (Figure 2.6.1 2.6. 1 ). Figure 2.6.1 2.6. 1: Each sample contains 6.022 ×1023 6.022 × …. Lee mu jin traffic light lyrics
The molar mass of an element is found on the periodic table, and it is the element's atomic weight in grams/mole (g/mol). If the mass of a substance is known, the number of moles in the substance can be calculated. Converting the mass, in grams, of a substance to moles requires a conversion factor of (one mole of substance/molar mass …Multiply the number of atoms by the atomic weight of each element found in steps 1 and 2 to get the mass of each element in 2H2S: Molar Mass (g/mol) H (Hydrogen) 4 × 1.00794 = 4.03176. S (Sulphur/Sulfur) 2 × 32.065 = 64.13. 4. Sum Each Element's Mass. Finally, add together the total mass of each element to get the molar mass of 2H2S:Molar mass of (H2) = 2.01588 g/mol Convert grams (H2) to moles or moles (H2) to grams Molecular weight calculation: (1.00794*2) Percent composition by element Element: …Molecular mass of H(2) = 2 xx Atomic mass of H =2 xx 1u = 2u.There are two videos that need to be reposted every time a mass shooting happens. AFTER ORLANDO’S MASS SHOOTING THIS WEEKEND I noticed an interesting trend on my feeds: people were...Examples of molecular weight computations: C[14]O[16]2, S[34]O[16]2. Definitions of molecular mass, molecular weight, molar mass and molar weight. Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). (1 u is equal to 1/12 the mass of one atom of carbon-12)Jun 28, 2023 ... Calculate the relative molecular mass of H2S. The molar mass of H2S @mydocumentary838.Sep 1, 2023 ... molar mass of H2CO3 (carbonic acid) l carbonic acid formula l h2co3 molecular weight l · Comments8.Examples of molecular weight computations: C[14]O[16]2, S[34]O[16]2. Definitions of molecular mass, molecular weight, molar mass and molar weight. Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). (1 u is equal to 1/12 the mass of one atom of carbon-12)Convertworld.com is a tool that allows you to convert Hydrogen molecule (H2) from different molar mass units to gram per mole, kilogram per mole, or standard …Examples of molecular weight computations: C[14]O[16]2, S[34]O[16]2. Definitions of molecular mass, molecular weight, molar mass and molar weight. Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). (1 u is equal to 1/12 the mass of one atom of carbon-12)Firstly, calculate the number of moles of H2 produced from mass using the formula: mass (in grams) = moles x molar mass. Therefore, moles of H2 = mass of H2 (in grams) / molar mass of H2, which provides 3.0 grams / 2 g/mol = 1.5 moles of H2. Next, use the mole ratio to find moles of Al that reacted.When we calculate the molecular weight of H2, we sum the atomic masses of its constituent atoms: Molecular weight of H2 = Atomic mass of H + Atomic mass of H. The Molecular weight of H2 = 1.008 amu + 1.008 amu. Molecular weight of H2 ≈ 2.016 amu. The molecular weight of H2 is approximately 2.016 atomic mass units (amu)..