Calculate the Molecular Masses of H2, O2, Cl2 ,Co2, CH4, C2H6, C2H4, NH3, CH2OH

The Molecular Masses of the Given Compounds Are:

• H2: 2 x 1.008 = 2.016 g/mol
• O2: 2 x 15.999 = 31.998 g/mol
• Cl2: 2 x 35.45 = 70.90 g/mol
• CO2: 1 x 12.011 + 2 x 15.999 = 44.01 g/mol
• CH4: 1 x 12.011 + 4 x 1.008 = 16.043 g/mol
• C2H6: 2 x 12.011 + 6 x 1.008 = 30.070 g/mol
• C2H4: 2 x 12.011 + 4 x 1.008 = 28.054 g/mol
• NH3: 1 x 14.007 + 3 x 1.008 = 17.031 g/mol
• CH2OH: 2 x 12.011 + 5 x 1.008 + 1 x 15.999 + 1 x 1.008 = 32.042 g/mol

Note that the molecular mass is the sum of the atomic masses of all the atoms in the molecule, expressed in grams per mole (g/mol).

Explanation:- 

Molecular mass is the sum of the atomic masses of all the atoms in a molecule. It is expressed in units of grams per mole (g/mol). This quantity is also known as the molar mass or molecular weight of the compound.

To calculate the molecular mass of a compound, we first need to determine the chemical formula of the compound, which tells us the types and numbers of atoms in the molecule. The atomic masses of the individual atoms can then be looked up in the periodic table, and the molecular mass is calculated by summing up the atomic masses of all the atoms in the molecule.

For example, consider the compound water, H2O. The chemical formula tells us that it contains two hydrogen atoms and one oxygen atom. The atomic mass of hydrogen is 1.008, and the atomic mass of oxygen is 15.999. The molecular mass of water is therefore:

Molecular mass of water = 2 x atomic mass of hydrogen + 1 x atomic mass of oxygen = 2 x 1.008 + 1 x 15.999 = 18.015 g/mol

Similarly, we can calculate the molecular masses of the other compounds given in the question by summing up the atomic masses of all the atoms in their chemical formulas.

The molecular mass of a compound is important in many areas of chemistry, as it is used to convert between mass and moles of the substance. This is useful in stoichiometric calculations, where we need to know the amounts of reactants and products involved in a chemical reaction.

Get Experts