How many grams of P2O5 and H2O will be produced in the reaction?
Let use the following example:
If 17.0g of phosphine is mixed with 16.0g of O2 and reaction occurs. How many grams of P2O5 and H2O will be produced in the reaction?
2PH3 + 4O2 → P2O5 + 3H2O
M(PH3) = 34.00 g/mol
n(PH3) "= \\frac{17.0}{34.0} = 0.5 \\;mol"
M(O2) = 32.00 g/mol
n(O2) "= \\frac{16.0}{32.0} = 0.5 \\;mol"
According to the reaction equation for one mole of phosphine we need two moles of O2. So, O2 is a limitting reactant.
According to the reaction:
n(P2O5) "= \\frac{1}{4}n(O_2) = \\frac{1}{4} \\times 0.5 = 0.125 \\;mol"
M(P2O5) = 142.0 g/mol
m(P2O5) "= 0.125 \\times 142.0 = 17.75 \\;g"
According to the reaction:
n(H2O) "= \\frac{3}{4}n(O_2) = \\frac{3}{4} \\times 0.5 = 0.375 \\;mol"
M(H2O) = 18 g/mol
m(H2O) "= 0.375 \\times 18.0 = 6.75 \\;g"
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