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# Graham's Law and Stoichiometry Problems

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Question #1

C2H2Br4 + 2Zn ----> C2H2 + 2ZnBr2

How many grams of ZnBr2 are produced from 125g of C2H2Br4?
Formula Weights are, H=1.01 C=12.0 Zn=65.4 Br=79.9

Question #2

Which gas molecules diffuse faster, NH3 (ammonia) or C3H8(propane)? Why? Whose Law is applied here?

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Graham's Law and Stoichiometry Problems are solved with full working. The expert determines which gas molecules diffuse faster.

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Question #1

C2H2Br4 + 2Zn ----> C2H2 + 2ZnBr2

How many grams of ZnBr2 are produced from 125g of C2H2Br4?
Formula Weights are, H=1.01 C=12.0 Zn=65.4 Br=79.9

MW C2H2Br4 =(2 x 12.0 g/mol) + (2 x 1.01 g/mol) + (4 x 79.9 g/mol) = 345.6 g/mol
MW ZnBr2 = 65.4 g/mol + (2 x 79.9 g/mol) = 225.2 g/mol

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