Question

Plz help How many moles are in 3.57 liters of NH3 at STP?

Answer 1

1) determine which formula you are going to use.

$PV=nRT$

2) list your information.

P = 101.325 kPa

V = 3.57 L

n = ?

R = 8.314 $\frac{kPa\ L}{mol\ K}$

T = 273.15 K

3) rearrange your formula

$n=\frac{PV}{RT}$

4) solve.

$n=\frac{(101.325\ kPa)(3.57\ L)}{(8.314\frac{kPa\ L}{mol\ K})(273.15\ K) } \\\\n=0.1592845319$

n = 0.159 mol NH₃