Question

A cylinder of nitrogen gas (N2) weighs 550 grams. How many moles of nitrogen are present in the cylinder?

Answer 1

Molar mass N2 = 14 x 2 => 28.0 g/mol

1 mole N2 ------------- 28.0 g
? moles N2 ----------- 550 g

550 x 1 / 28.0 => 19.64 moles of N2

Answer 2

Moles of nitrogen present in the cylinder = 19.64 mol

Step-by-step explanation:

Given:

Weight of
`N_2` = 550 g

Formula for the calculation of moles is:

`mol=(Weight\ in\ g)/(Molecular\ mass)`

Molecular mass of
`N_2` = 28 g/mol

`mol=(550\ g)/(28\ g/mol) = 19.64\ mol`

Moles of nitrogen present in the cylinder = 19.64 mol