What is the volume, in liters, of 0.500 mol of #C_3H_8# gas at STP?

1 Answer
Aug 20, 2016

Answer:

#color(blue)("11.2 L")#

Explanation:

Because we are at standard temperature and pressure and are given only one set of conditions, we can to use the ideal gas law equation:
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I should mention that the pressure does not always have units of atm, it depends on the units of pressure given in the gas constant.

List your known and unknown variables.

#color(purple)("Knowns:"#
- Number of moles
- Temperature
- Pressure

#color(blue)("Unknowns:"#
Volume of #C_3H_8(g)#

At STP, the temperature is 273K and the pressure is 1 atm.

Let's rearrange the equation to solve for V:

# (nxxRxxT)/P#

#V = (0.500cancel"mol"xx0.0821Lxxcancel(atm)/cancel(molxxK)xx273cancelK)/(1cancel(atm)#

#V = 11.2 L#