What mass of water is produced from the complete combustion of 8.90×10−3g of methane

Answer 1

balance the equation

CH4+O2>>H2O + CO2

Then, when balanced, calculate the moles of methane you have (it won't be much, .0089g is a small quanitity).

Then,using the coefficents on the balanced equation, determine how many moles of water you get.