When left over a flame a marshmallow is consumed in a combustion reaction. assuming a marshmallow is made of entirely sucrose, c12h22o11, and after combustion no residual solid remained, the following chemical equation describes this reaction. c12h22o11(s) + 12 o2(g) → 12 co2(g) + 11 h2o(g) using the equation above, if the marshmallow contains 6.84 g of sucrose and is the limiting reactant, what is the theoretical yield, in g, of h2o?