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When 1.799 g of naphtalene (C10H8) is burned in a constant-volume bomb calorimeter at 298 K,...

When 1.799 g of naphtalene (C10H8) is burned in a constant-volume bomb calorimeter at 298 K, 72.31 kJ of heat is evolved.

Calculate U and w for the reaction on a molar basis.

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Answer #1

A bomb calorimeter is used to measure the change in internal energy, U, of a reaction at a constant volume.

U = qv = 72.31 KJ/mol

No. of moles of naphthalene (n) = mass given / molecular mass = 1.799 / 128.17 = 0.01403

Molar U = U / n = 72.31 / 0.01403 = 5165 KJ

Work Done, w = -pdV

For constant-volume bomb calorimeter dV = 0

Therefore, w = 0

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