**Definitions:**

**Gram** (abbreviation: **gm**): is a SI (metric) system unit of mass. Where, at the temperature of melting ice, it is the absolute weight of a volume equal to the hundredth part of a metre cube of pure water.

**Atomic Mass Unit** (abbreviations: **amu, or u**): also known as dalton (symbol: Da), is a standard unit of mass that used on an atomic or molecular scale (atomic mass). One unified atomic mass unit is about the mass of one nucleon (either a single proton or neutron) and equivalent to 1 g/mol.

## How to Convert Grams to Atomic Mass Units

*Example: How many atomic mass units are equivalent to 72.29 grams?*

As;

1 grams = 6.024E+23 atomic mass units

72.29 grams = Y atomic mass units

Assuming Y is the answer, and by criss-cross principle;

Y equals 72.29 times 6.024E+23 over 1

(i.e.) Y = 72.29 * 6.024E+23 / 1 = 4.3547496E+25 atomic mass units

Answer is: 4.3547496E+25 atomic mass units are equivalent to 72.29 grams.

*Practice Question: Convert the following units into amu:*

N.B.: After working out the answer to each of the next questions, click adjacent button to see the correct answer.

( i ) 26.72 gm

( ii ) 56.5 gm

( iii ) 2.23 gm