Determine the molar mass of :

1. H20
2. Co2
3.NaCl

1 is the chemical formula for water, meaning that each of its molecules contains one oxygen and two hydrogen atoms.

2 a colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air (about 0.03 percent) and is absorbed by plants in photosynthesis.

3 Chemical abbreviation for sodium chloride (table salt)

answer no 1.

18.02 g/mol

The average mass of one H2O molecule is 18.02 amu. The number of atoms is an exact number, the number of mole is an exact number; they do not affect the number of significant figures. The average mass of one mole of H2O is 18.02 grams. This is stated: the molar mass of water is 18.02 g/mol.

answer no 2.

The molecular mass of carbon dioxide is 44.01amu. The molar mass of any compound is the mass in grams of one mole of that compound. One mole of carbon dioxide molecules has a mass of 44.01g, while one mole of sodium sulfide formula units has a mass of 78.04g. The molar masses are 44.01g/mol and 78.04g/mol respectively

answer no 3.

The molar mass of sodium is 22.990 g/mol. The molar mass of chlorine is 35.45 g/mol. To calculate the molar mass of NaCl, multiply the subscript of each element times its molar mass, then add them together. If there is no subscript, it is understood to be 1 .

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