The number of moles of propane is used to obtain the required results in each case. It is gotten from the equation of the reaction.
a) The balanced equation of the reaction is;
C3H8 + 5O2 -----> 3CO2 + 4H2O
Number of moles of propane = 38.8g/44 g/mol = 0.88 moles
From the reaction equation;
1 mole of propane reacts with 5 mole of oxygen
0.88 moles of propane reacts with 0.88 × 5/1 = 4.4 moles of oxygen.
If 1 mole of oxygen occupies 22.4 dm^3
4.4 moles of oxygen occupies 4.4 moles × 22.4 dm^3/ 1 mole= 98.56 dm^3 of oxygen
b) Number of moles of propane =40.0g /44 g/mol = 0.91 moles of propane
1 mole of propane yields 4 moles of water
0.91 moles of propane yields 0.91 × 4/1 = 3.64 moles of water
Mass of water = 3.64 moles of water × 18 g/mol = 65.52 g of water
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