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ChemistryThermochemistryEnthalpy of CombustionMedium2 minQB

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Passage / Comprehension

A bomb calorimetry experiment is performed with xylose, C₅H₁₀O₅ (s), as the combustible substance. The data obtained are

mass of xylose burned : 4.5 gm

heat capacity of calorimeter : 4.5 kJ/°C

initial calorimeter temperature : 27°C

final calorimeter temperature : 27.2°C

Calculate enthalpy of combustion of $C_{5} H_{10} O_{5} (s)$ in $kJ /$ mole.

Answer:

30.00

Solution:

$C_{5} H_{10} O_{5} (s) + 5 O_{2} (g) \to 5 CO_{2} (g) + 5 H_{2} O (ℓ)$

$∵ Δ n_{g} = 0$

$∴ Δ H = Δ U = q_{v} = 30 kJ /$ mole

Stream:JEESubject:ChemistryTopic:ThermochemistrySubtopic:Enthalpy of Combustion

⏱ 2mℹ️ Source: QB

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