Chemistry - Thermochemistry Question with Solution | TestHub

ChemistryThermochemistryEnthalpy of CombustionMedium2 minQB

ChemistryMediumnumerical

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

What is the heat of combustion of xylose, in kilo-joules per mole ?

Answer:

30.00

Solution:

$q = C Δ T = 4.5 \times 0.2 = 0.9 kJ$

mole of $C_{5} H_{10} O_{5}$ burned $= \frac{4.5}{150} = 0.03$ mole

∴ Heat of combustion of $C_{5} H_{10} O_{5} = \frac{0.9}{0.03} = 30 kJ / mole$

Stream:JEESubject:ChemistryTopic:ThermochemistrySubtopic:Enthalpy of Combustion

⏱ 2mℹ️ Source: QB

Loading discussions...