4D.23

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VioletKo3F
Posts: 103
Joined: Sat Sep 07, 2019 12:18 am

4D.23

Postby VioletKo3F » Wed Feb 12, 2020 3:19 pm

Why do you need to subtract twice the enthalpy of formation of NO to get the total reaction enthalpy?
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Angela Patel 2J
Posts: 110
Joined: Sat Aug 24, 2019 12:17 am

Re: 4D.23

Postby Angela Patel 2J » Wed Feb 12, 2020 4:00 pm

Because there are two moles of NO gas. Standard enthalpies of formation are given per mole, so you need to multiply each one by the number of moles when using the equation given on the formula sheet.
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Ivan Tadeja 1G
Posts: 81
Joined: Fri Sep 28, 2018 12:28 am

Re: 4D.23

Postby Ivan Tadeja 1G » Sun Feb 16, 2020 10:28 pm

We subtract twice the value because it is asking for the total reaction enthalpy and there are 2 mol of NO. If was asking for the enthalpy for the formation of 1 mol, then the initial value would be your answer.
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