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Concentration Terms - An Introduction (w/w etc)

2500 cm3 of...

Question

$2500$ $c m^{3}$ of oxygen $[O_{2}]$ was burnt with $600$ $c m^{3}$ of ethane $[C_{2} H_{6}]$ . The volume of unused oxygen is:

400

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1200

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0

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1800

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Solution

The correct option is A $400$ cc
Reaction:
$2 C_{2} H_{6} + 7 O_{2} ⟶ 4 C O_{2} + 6 H_{2} O$
$2$ $7$ $4$
$2$ vol $7$ vol $4$ vol
$600$ cc $5200 - 2100 = 400$ cc $1200$ cc

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C_{2} H_{6}

2500

600

[C_{2} H_{6}]

1200 c of oxygen was burnt with 400 cc of Methane $(C H_{4})$ . Calculate the volume of unused oxygen left, after writing the balanced equation.

Methane + Oxygen $\to$ Carbon dioxide + Water vapour

C O_{2}

H_{2} O

2 C_{2} H_{6} + 7 O_{2} \to 4 C O_{2} + 6 H_{2} O

1250

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