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Enthalpy of Combustion

When 1 g of a...

Question

When 1 g of anhydrous oxalic acid is burnt at $25^{0} C$ , the amount of heat liberated is $2.835 k J$ . $△ H$ combustion is: (oxalic acid: $C_{2} H_{2} O_{4}$ ):

- 255.15 k J

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- 445.65 k J

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- 295.24 k J

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- 155.16 k J

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Solution

The correct option is A $- 255.15 k J$
Oxalic acid $C_{2} H_{2} O_{4}$
Molar mass $= 90$
Mass $= \frac{1}{90} m o l a r$

$(Δ H_{c o m b})_{C_{2} H_{2} O_{4}} = - \frac{Heat Liberated}{moles}$

$= - \frac{2.835 k J}{1 / 90}$

$= - 255.15 k J$

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△

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