Suppose 0.30 g of ethane is mixed with 0.47 g of oxygen. Calculate the maximum mass of water that could be produced by the chemical reaction. Be sure your answer has the correct number of significant digits.

Answer 1

Write the equation and balance it.
Convert 0.30g ethane to moles.
Convert 0.47 g oxygen to moles.
Using the coefficients in the balanced equation, convert moles ethane to moles H2O.
Do the same with moles oxygen.
You will have two answers and both can't be right. The correct answer in limiting reagent problems is ALWAYS the smaller value and the reagent producing that number is the limiting reagent. The take the smaller number and convert to moles. g = moles x molar mass.
Post your work if you get stuck.