explanation:
complete balanced equation
2C3H6 + 9 O2 ------------------> 6CO2 + 6 H2O
2 moles C3H6 ----------------> 6 moles CO2
0.1 mole C3H6 ---------------> 6 x 0.1 / 2 = 0.3 moles CO2
moles of C3H6 calculate by the formula
moles = mass / molar mass
= 4.2 / 42
= 0.1
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