Answer to Question #30674 in Other Chemistry for Kel
How many moles of P4 would you need to produce 34 grams of PH3?
P4 (s) + 6H2 (g) ____> 4PH3 (g)
First of all we can find the amount of substance of PH3. We can use the formula n = m/M where n - the amount of substance m - the mass M - the molar mass, which can be calculated as follows: M(PH3) = Ar(P) +3*(H) = 31+ 3*1 = 34 g/mol n(PH3) = 34 g / 34 g/mol = 1 moles According the equation P4(s) + 6H2(g) ---> 4PH3(g) we can find the amount of substance of P4: n(P4) = n(PH3)/4 = 1/4 = 0.25 moles Answer: 0.25 moles