# How to calculate Moles to grams in a substance or compound?

## Practice questions/worksheet on moles to grams

Use the following formula to calculate Moles to grams.

Mole(n)= Mass of a substance(m)/ Molar mass(Mr)

so mass of a substance , m= nx Mr

The first question is solved for you.

For calculating Molar mass, you need to add the relative atomic masses of all the atoms in a

compound or ion. For example Mr of Na2O = (23×2)+16 = 62 ,

because  Ar( relative atomic mass) of Na=23,

Ar( relative atomic mass) of O= 16

so  mass of 1.5  moles of Na2O= 1.5×62= 93 g

Calculate mass  in  1.5 moles of Na2O

Calculate mass  in  2.5 moles of H2O

Calculate mass  in  3.5 moles of NaOH

Calculate mass  in  0.5 moles of MgO

Calculate mass  in  4.5 moles of Mg(OH)2

Calculate mass  in  0.5 moles of Li2O

Calculate mass  in  2.5 moles of HCl

Calculate mass  in  6.5 moles of LiCl

Calculate mass  in  1.5 moles  of MgCl2

Calculate mass  in  5.5 moles of P4O10

Calculate mass  in  0.5 moles of H3PO4

Calculate mass  in  7.5 moles of Cl2O7

Calculate mass  in  1.15 moles of HClO4

Calculate mass  in  1.25 moles of SO2

Calculate mass  in  1.35 moles of H2SO3

Calculate mass  in  1.45 moles of SiO2

Calculate mass  in  1.55 moles of Al2O3

Calculate mass  in  10.5 moles of H2SO4

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Calculate mass  in  1.35 moles of CO

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Calculate mass  in  1.45 moles of CO2

Calculate mass  in  1.55 moles of N2

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