Question

In: Chemistry

Calculate the mass of water produced when 6.39 g of butane reacts with excess oxygen

Calculate the mass of water produced when 6.39 g of butane reacts with excess oxygen

Solutions

Expert Solution

2C4H10 + 13O2 ---------> 8CO2 + 10H2O
Molar mass of butane = 58.12 g/mol
mass of butane = 6.39 g
number of moles of butane = mass / molar mass
                                                          = 6.39 / 58.12
                                                          =0.11 mol

2 mol of butane produces 10 mol of H2O
so mol of H2O produce = 5 * number of moles of butane
                                                = 5* 0.11
                                                 = 0.55 mol

Molar mass of H2O = 18 g/mol
mass of water = molar mass * number of moles
                             = 18*0.55
                             = 9.9 g
Answer: 9.9 g


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