Multiple Choice
A gas sample contains 4.0 g of CH_4 and 2.0 g of He. What is the total volume of the sample at STP (0°C, 1 atm)?
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7. Gases
Gas Stoichiometry
Multiple Choice
At STP, what volume of argon gas is occupied by 1.60 grams of argon?
A
22.4 L
B
0.90 L
C
2.24 L
D
1.12 L
Verified step by step guidance1
Identify the molar mass of argon (Ar). Argon has an atomic mass of approximately 39.95 g/mol.
Calculate the number of moles of argon gas using the formula: \(\text{moles} = \frac{\text{mass}}{\text{molar mass}} = \frac{1.60\ \text{g}}{39.95\ \text{g/mol}}\).
Recall that at STP (Standard Temperature and Pressure), 1 mole of any ideal gas occupies 22.4 liters.
Calculate the volume occupied by the argon gas using the formula: \(\text{volume} = \text{moles} \times 22.4\ \text{L/mol}\).
Substitute the moles calculated in step 2 into the volume formula to find the volume of argon gas at STP.
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