First slide

Stoichiometry and Stoichiometric Calculations

Question

At 300 K, 40 ml of Ethylene is subjected to combustion with 160 ml of Oxygen in a closed vessel. The reaction is highly exothermic. On cooling to 300 K, the volume of gases left in the vessel would be

Moderate

A

40ml
B

160ml
C

120ml
D

80ml

Solution

$\underset{40 ml}{C_{2} H_{4} (g)} + \underset{(\begin{array}{l} 120 ml \\ 160 ml \end{array}) 40 ml excess}{3 O_{2} (g)} \to \underset{80 ml}{2 {CO}_{2} (g)} + 2 H_{2} O (l)$
Total volume of gases left = (40 + 80) ml = 120 ml

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