Question

The amount of heat evolved on combustion of 10 grams of benzoic acid is 10 K.Cals.The heat of combustion of benzoic acid is1)-122 K.Cals2) -112 K.Cals3) -132 K.Cals 4) -92 K.Cals​

Answer 1

Answer:

1) -122 K.Cals

Explanation:

Benzoic Acid Formula is C₆H₅CO₂H. Molar Mass is 122.123 g/mol.

if the -10 K. Cal of heat evolve on combustion of 10g benzoic acid. Then the heat of combustion for 122.123 g benzoic acid is -122.123 k.cal

Answer 2

The heat of combustion of benzoic acid is -122 kcal

Explanation:

Heat of combustion is the amount of heat released when 1 mole of the compound is completely burnt in the presence of oxygen.

Given : 10 g of benzoic acid releases = 10 kcal of heat

To find out the heat given off by burning  1 mole of the benzoic acid

Moles of bezoic acid=[tex]\frac{\text {given mass}}{\text {Molar mass}}= $\frac{10g}{122.1g/mol}=0.08189mol$

0.08189 moles of benzoic acid releases = 10 kcal

1 mole of benzoic acid releases =$\frac{10}{0.08189}\times 1=122kcal$ of heat

As the heat is released, the heat of combustion of benzoic acid is -122 kcal.

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