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 H for this process?

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We are asked to identify the value of ΔH for the process given.

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.

We are given a gas that is confined to a cylinder under constant atmospheric pressure. 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.

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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 H for this process?

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