Hydrogen and oxygen gas are mixed in a 7.75 L flask at 65 degree C and contains

Question

Hydrogen and oxygen gas are mixed in a 7.75 L flask at 65 degree C and contains 0.472 grams of hydrogen and 4.68 grams of oxygen. Calculate the partial pressures of oxygen and hydrogen in the flask. Calculate the total pressure as well Magnesium metal (0.100 mol) and a volume of aqueous hydrochloric acid that contains 0.400 mol of HCl are combined and react to completion as shown below. Calculate the volume of hydrogen gas produced in liters at STP conditions. Mg(s) + 2HCl(aq) rightarrow MgCl_2(aq) + H_2(g) (R = 0.08206 L middot atm/K middot mol)

Explanation / Answer

Q8

mol of H = mass/MW = 0.472/2 = 0.236

mol of O2=mass/MW = 4.68/32 = 0.14625

total mol = 0.14625+0.236 = 0.38225

find total P:

P = nRT/V

P = 0.38225*(0.082)(65+273)/(7.75)

P = 1.36702 atm

so..

mol frac of H2 = 0.236/0.38225 = 0.61739

mol frac of O2= 0.14625/0.38225 = 0.3826

P-H2 = x-H2*Ptotal = 0.61739*1.36702 = 0.843

P-O2= x-O2*Ptotal = 0.3826*1.36702 = 0.523 atm

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