Question

Define formula mass and how it differs from molecular mass

Answer 1

Answer:

Explanation:g

Answer 2

Answer:

the molecular mass of a substances is the relative mass of its molecule as compared with the mass of carbon-12 atom taken as 12units.

Explanation:

the molecular mass is equal to sum of the atomic masses of all atoms present in one molecule of the substance.

• the molecular mass of water can be calculated as follows:

mass of H atom=1 u

Mass of 2H atoms =2*1=2u

Mass of O atom =16 u

now, Molecular mass of H2O=Mass of 2H atoms +Mass of O atom=2+16=18u

thus,the molecular mass of water (H2O)is 18u.