Multiple Choice
What is the density of hydrogen sulfide (H₂S) at 1.7 atm and 265 K? Answer in units of g/L.
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7. Gases
The Ideal Gas Law: Density
Multiple Choice
What is the density of ethane (C2H6) at standard temperature and pressure (STP)?
A
1.34 g/L
B
0.98 g/L
C
1.25 g/L
D
1.50 g/L
Verified step by step guidance1
Start by recalling the definition of standard temperature and pressure (STP), which is 0°C (273.15 K) and 1 atm pressure.
Use the ideal gas law equation: , where P is pressure, V is volume, n is moles, R is the ideal gas constant, and T is temperature.
Calculate the molar mass of ethane (C2H6) by adding the atomic masses of carbon and hydrogen: .
At STP, 1 mole of any gas occupies 22.4 L. Use this information to find the mass of ethane in 22.4 L using its molar mass.
Finally, calculate the density using the formula: , where m is mass and V is volume. Substitute the mass of ethane and the volume (22.4 L) to find the density.
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