The reaction C 2 H 6 (g) C 2 H 4 (g) + H 2 (g), requires thatwork be done to mak

Question

The reaction C2H6(g) C2H4(g) + H2(g), requires thatwork be done to make it occur.
Calculate the minimum mass,in grams, of hydrogen gas that would have to be burned toform water vapor in order to provide the necessary work to produce188.0g of ethylene. The reaction C2H6(g) C2H4(g) + H2(g), requires thatwork be done to make it occur.
Calculate the minimum mass,in grams, of hydrogen gas that would have to be burned toform water vapor in order to provide the necessary work to produce188.0g of ethylene.

Explanation / Answer

if you know the moles of H2, then you can calculate the massin grams for H2. to find the moles of H2: find the moles of C2H6 using the massprovided. so # of moles of C2H6 = 188g x mol / 28.06g = 6.69moles. for every one mole of C2H6 there is a one mole of H2. so for6.69moles of C2H6 there are 6.69 moles of H2. multiply the # of moles of H2 by molar mass of H2 to get themass. 6.69moles x 2.02g/mol = 13.5grams Hope that helps

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