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

Answer:

Moles of nitrogen present in the cylinder = 19.64 mol

Explanation:

Given:

Weight of $N_2$ = 550 g

Formula for the calculation of moles is:

$mol=\frac{Weight\ in\ g}{Molecular\ mass}$

Molecular mass of $N_2$ = 28 g/mol

$mol=\frac{550\ g}{28\ g/mol} = 19.64\ mol$

Moles of nitrogen present in the cylinder = 19.64 mol