Which statement concerning relative rates of reaction is correct for the chemica

Question

Which statement concerning relative rates of reaction is correct for the chemical equation given below?
        2 Al(s) + 6 HCl(g) 2 AlCl3(s) + 3 H2(g)

A)the rate of disappearance of Al is double the rate of appearance of AlCl3 B)the rate of disappearance of HCl is 1/2 the rate of appearance of H2 C)the rate of appearance of AlCl3 is three times the rate of disappearance of HCl D)the rate of appearance of H2 is equal to the rate of disappearance of Al E)the rate of appearance of AlCl3 is 2/3 the rate of appearance of H2

Explanation / Answer

if you divide the hole equation with 3

2/3 Al(s) +2 HCl(g) 2/3 AlCl3(s) + H2(g)

1/2 delta [AlCl3]/deltaT = 1/3 [delta H2]/deltaT

so

E)the rate of appearance of AlCl3 is 2/3 the rate of appearance of H2

is correct

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