Question

Be sure to answer all parts. Hydrogen gas has been suggested as a clean fuel because it produces only water vapor when it burns. If the reaction has a 76.2% yield, what mass of hydrogen forms 765 kg of water? _____× 10__ g Enter your answer in scientific notation.

Answer 1

actual yield of H2O   = 765Kg = 765000g

percentage yield   = actual yield*100/theoritical yield

76.2                       = 765000*100/theoritical yield

thoritical yiled        = 765000*100/76.2

                             = 765000*100/76.2   = 1003937g

2H2 (g) + O2------------------> 2H2O

2 moles of H2O produced from 2 moles of H2

2*18g of H2O produced from 2*2g of H2

`1003937g of H2O produced from =2*2*1003937/2*18   = 111548g of H2 = 1.2*10^-5g of H2 >>>answer