Problem: A gas is confined to a cylinder under constant atmospheric pressure, as illustrated in the following figure. When the gas undergoes a particular chemical reaction, it absorbs 826 J of heat from its surroundings and has 0.66 kJ of P-V work done on it by its surroundings.What is the value of E for this process?

FREE Expert Solution

We are being asked to calculate ΔE or the internal energy of the system. 


The internal energy (ΔE or ΔU) of a system can be calculated from the heat and work of the system. The relationship between internal energy, heat, and work is shown in the following equation:

E = q + w

ΔE = internal energy, J
q = heat, J
w = work, J

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Problem Details
A gas is confined to a cylinder under constant atmospheric pressure, as illustrated in the following figure. When the gas undergoes a particular chemical reaction, it absorbs 826 J of heat from its surroundings and has 0.66 kJ of P-V work done on it by its surroundings.

A diagram shows a piston as containing a system consisting of H2 (gas) and O2 (gas).  The surroundings are the cylinder, piston, and everything else.  Energy can enter or leave the system as heat or as work done on the piston, but matter cannot enter or leave the system.

What is the value of E for this process?

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