referring to the reaction where ethane in the presence of oxygen if you start with 15 g of ethane how many grams of water will you make

Answer 1

2C2H6 + 7O2 ==> 4CO2 + 6H2O ... balanced equation for combustion of ethane

moles ethane = 15 g x 1 mole/30 g = 0.5 moles

mass H2O produced = 0.5 moles C2H6 x 6 moles H2O/2 moles C2H6 x 18 g/mole H2O = 27 g H2O