A reaction of Mg and HCl generates 20.0 mL of gas, which was collected by water displacement in a 22 degrees celcius bath. The barometric pressure was 740 mmHg.
Use the combined gas law to calculate the volume of hydrogen at STP.
Attempt at solution: I calculated that the pressure of the hydrogen gas is 720 mmHg, the temperature is 293 K, but how do I figure out the volume of the hydrogen gas? Do I just use 20.0 mL? However, isn"t some of that 20.0 mL water vapor? Once I can figure this out I know it is simply plugging in the values into P1V1/T1 = P2V2/T2.
Thanks.
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