Assuming plenty of oxygen, then
for each mole of propane, one will get 4 moles of water vapor. Figure the moles of H2O, convert that to mass.
Your teacher is just too easy.
Calculate the mass of H2O that is produced from the combustion of 13.8 mol of C3H8n propane.
C3H8 + 5O2---> 3CO2 + 4H2O
known: 13.8mol C3H8
unknown: mass of H2O
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