Multiple Choice
Which of the following lists correctly identifies the four variables used to describe gases in the ideal gas law, along with one possible unit for each variable?
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7. Gases
The Ideal Gas Law Applications
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What is the volume occupied by 51.0 g of ammonia (NH_3) gas at standard temperature and pressure (STP)?
A
30.0 L
B
67.2 L
C
22.4 L
D
44.8 L
Verified step by step guidance1
Identify the given information: mass of ammonia (NH\_3) is 51.0 g, and the conditions are at standard temperature and pressure (STP). At STP, 1 mole of any ideal gas occupies 22.4 L.
Calculate the molar mass of ammonia (NH\_3) by adding the atomic masses: N = 14.0 g/mol and H = 1.0 g/mol. So, molar mass = 14.0 + (3 \times 1.0) g/mol.
Convert the given mass of ammonia to moles using the formula: moles = mass / molar mass.
Use the molar volume at STP to find the volume occupied by the gas: volume = moles \times 22.4 L/mol.
Express the final volume in liters, which will be the volume occupied by 51.0 g of ammonia gas at STP.
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