Question

Hydrogen gas has a density of 0.090 g/L, and at normal pressure and -1.72 °C one mole of it takes up 22.4 L.

How would you calculate the moles in 900.0 g of hydrogen gas? Set up the math. Just leave your answer as a math expression.

Answer 1

Answer: The number of moles of given amount of hydrogen gas is
`x=(900.0g)/(2g/mol)`

Step-by-step explanation:

To calculate the number of moles, we use the equation:

`\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}`

We are given:

Let the number of moles of hydrogen gas be 'x'

Given mass of hydrogen gas = 900.0 g

Molar mass of hydrogen gas = 2 g/mol

Putting values in above equation, we get:

`x=(900.0g)/(2g/mol)=450mol`

Hence, the number of moles of given amount of hydrogen gas is
`x=(900.0g)/(2g/mol)`