Question

The ratio between the number of molecules in 2 g of hydrogen and 32 g of oxygen is ______.

\[\text{Atomic mass: H = 1, O = 16}\]

Options

• 1 : 2

• 1 : 0.01

• 1 : 1

• 0.01 : 1

Answer 1

The ratio between the number of molecules in 2 g of hydrogen and 32 g of oxygen is 1 : 1.

Explanation:

Hydrogen and oxygen gases are diatomic, so their molar masses are 2 and 32 respectively. Thus, 2 g of hydrogen and 32 g of oxygen are each 1 mole and contain equal numbers of molecules.