Help with this chemistry problem?
Zn+2HCl-->ZnCl2+H2
how many grams of hydrogen gas can be obtained if 50.0g of zinc react completely?
Answer:
Mole ratio between Zn and H2 is 1:1
Moles of Zn in 50.0g is 50/65 =0.769 moles (using n = m/Mr)
Hence moles of H2 formed is also 0.769 (1:1 ratio)
Hence the mass of Hydrogen (H2) formed = 0.769 x 2 = 1.54g
again using n = m/Mr, m = nMr.
Note: m=mole(s)
50g Zn.x.(1mZn/65.39g)x
(1mH2/1mZn)x(2.0158gH2/1mH2)=
1.5g H2
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