Question

Ammonia gas has a molar mass of approximately 17 grams per mole. At 290K and 1.2 atm, a sample of ammonia has a volume of 3.7 L.

Answer 1

Ammonia gas will have a mass of 3.17grams.

HOW TO CALCULATE MASS:

• The mass of a substance can be calculated by multiplying the number of moles in the substance by its molar mass.

• However, to calculate the number of moles present in the ammonia gas given in this question, we use the formula as follows:

• PV = nRT

where;

1. P = pressure (atm)
2. V = volume (L)
3. n = number of moles (mol)
4. R = gas law constant
5. T = temperature

n = PV ÷ RT

n = (1.2 × 3.7) ÷ (0.0821 × 290)

n = 4.44 ÷ 23.81

n = 0.186mol

• Mass = 0.186 × 17

• Mass of ammonia gas = 3.17g

• Therefore, the mass of ammonia gas is 3.17grams.

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