a. 2PH3 + 4O2 → P2O5 + 3H2O
b. M(PH3) = 40 g/mol
M(O2) = 32 g/mol
n=Mm
n(PH3) = 35/40 = 0.875 mole
n(O2) = 2n(PH3) =2×0.875=1.75mol
m=n×M
m(O2) =1.75×32=56g
c. M(P2O5) = 284 g/mol
m(H2O) = 18 g/mol
n(P2O5) = 1/2n(PH3) =1/2×0.875=0.4375mol
m(P2O5) = 0.4375×284=124.25g
n(H2O) = 3n(P2O5) =3×0.4375=1.315mol
m(H2O) =1.315×18=23.67g
d. Proportion:
250 g — 64 %
x — 100 %
x = 391 g
n(P2O5) =28491=1.37mol
n(PH3) = 2n(P2O5) =2×1.37=2.74mol
m(PH3) =2.74×40=109.6g
Comments
Dear Trac. Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per liters of a solution. Molarity is also known as the molar concentration of a solution.
What Is M???
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