Of course it applies.
pTotal = pH2O + pH2
Look up the vapor pressure of H2O and substitute that for pH2O. I don't think everyone uses the same numbers for SATP but I will use P of 100 kPa or 0.987 atm so that is PTotal. If you looked up pH2O in mm then convert 0.987 to mm Hg also. That allows you to calculate pH2.
For C, I would use (p1v1/t1) = (p2v/t2)
p1 is pH2 from above in mm Hg.
p2 = 0.987*760 mm Hg.
t1 = 298
t2 = 298 and you really don't need to use t1 and t2 since they are the same.
v1 = 500 mL
v2 = ?
Under SATP, magnesium was reacted with acid and 500 ml of hydrogen gas was collected over water.
A) what is the vapor pressure of water?
B) What is the pressure of the hydrogen gas?
C) What amount of hydrogen was produced?
I only know how to do the law of partial pressures and i don't think it applies to this? please help! thanks!
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