A bomb calorimeter, or constant volume calorimeter, is a device often used to de

Question

A bomb calorimeter, or constant volume calorimeter, is a device often used to determine the heat of combustion of fuels and the energy content of foods. Since the "bomb" itself can absorb energy, a separate experiment is needed to determine the heat capacity of the calorimeter. This is known as calibrating the calorimeter. In the laboratory a student burns a 0.402-g sample of biphenyl (C_12H_10) in a bomb calorimeter containing 1190. g of water. The temperature increases from 24.10 degree C to 26.90 degree C. The heat capacity of water is 4.184 J g^-1 degree C^-1. The molar heat of combustion is -6251 kJ per mole of biphenyl. C_12H_10(s) + 29/2 O_2(g) rightarrow 12 CO_2(g) + 5 H_2O(l) + Energy Calculate the heat capacity of the calorimeter.

Explanation / Answer

q = m*s*DT + Cp*DT

heat released = 6251*(0.402/154.21) = 16.3 kj

16.3*10^3 = 1190*4.184*(26.9-24.1)+ x*(26.9-24.1)

x = 842.5 j/C = heatcapacity of calorimeter

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.