First slide

Gaseous state

Question

A 350 mL sample of ammonia at 1.00 bar and 27°C is absorbed by water to form 500 mL of solution at that temperature and pressure. Molar concentration of arnmonia is

Moderate

A

0.28 M
B

0.028 M
C

2.8 M
D

0.014 M

Solution

$Moles of ammonia = \frac{pV}{RT} = \frac{1 \times 0 .350}{0 .083 \times 300} = 0 .0140 mol Molar concentration = \frac{mol}{volume in L} = \frac{0 .0140}{0 .500} = 0.0280 M$

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