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8.53 Bomb Calorimeter 6th Ed

Posted: Thu Feb 07, 2019 10:44 pm
by Sarah Bui 2L
In question 53, the solution manual mentions that because it is in a bomb calorimeter you know that the volume is fixed. Can someone explain to me why? I also had the question of why the q being calculated is negative?

The reaction of 1.40 g of carbon monoxide with excess water vapor to produce carbon dioxide and hydrogen gases in a bomb calorimeter causes the temperature of the calorimeter assembly to rise from 22.113 'C to 22.799 'C. The calorimeter assembly is known to have a total heat capacity of 3.00 kJ·('C)$1. (a) Write a balanced equation for the reaction. (b) Calculate the internal energy change, delta U, for the reaction of 1.00 mol CO(g)

Re: 8.53 Bomb Calorimeter 6th Ed

Posted: Thu Feb 07, 2019 11:51 pm
by Carissa Young 1K
Bomb calorimeters are insulated and essential makes the system isolated which is a reason that volume is fixed because if it weren't then an external force like a piston could compress the volume, but in an isolated system, nothing exchanges with the surroundings.

using the equation q=-C(cal) x deltaT makes the q negative, but also the system is doing work on the surroundings therefore q is negative