Author Question: A 21.8 g sample of ethanol (C2H5OH) is burned in a bomb calorimeter according to the following ... (Read 346 times)

deesands · **on:** Nov 18, 2019

Question 1

A chemist wishes to calibrate a bomb calorimeter, so she combusts 5.58 g of 4-pentenoic acid, ΔcombustionU = -26.77 kJ g-1, which causes a temperature change from 23.4 °C to 38.9 °C. What should the chemist report for the value of Ccal?
◦ 6.10 kJ °C-1
◦ 9.64 kJ °C-1
◦ 17.5 kJ °C-1
◦ 7.61 kJ °C-1
◦ 28.7 kJ °C-1

Question 2

A 21.8 g sample of ethanol (C2H5OH) is burned in a bomb calorimeter according to the following reaction. If the temperature rises from 25.0 °C to 62.3 °C, determine the heat capacity of the calorimeter. The molar mass of ethanol is 46.07 g mol^-1.

C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(g)

D_rU = -1235 kJ mol-1

◦ 4.99 kJ °C-1
◦ 33.1 kJ °C-1
◦ 63.7 kJ °C-1
◦ 5.65 kJ °C-1
◦ 15.7 kJ °C-1

gcook · **Reply #1 on:** Nov 18, 2019

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