**Definitions:**

**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.

**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.

## How to Convert Atomic Mass Units to Grams

*Example: How many grams are equivalent to 40.29 atomic mass units?*

As;

1 atomic mass units = 1.66E-24 grams

40.29 atomic mass units = Y grams

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

Y equals 40.29 times 1.66E-24 over 1

(i.e.) Y = 40.29 * 1.66E-24 / 1 = 6.68814E-23 grams

Answer is: 6.68814E-23 grams are equivalent to 40.29 atomic mass units.

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

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

( i ) 1.8 amu

( ii ) 3.91 amu

( iii ) 1.61 amu