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CHM1 12Example10 Collection

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Oct 18, 2019, 1:17:49 AM
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Example 10

See the calculation on this YouTube video

Solution We use the following strategy to manipulate the three experimental equations so that when added they yield Eq. (1):

a) Since Eq. (1) has 2 mol C on the left, we multiply Eq. (2a) by 2.

b) Since Eq. (1) has 1 mol H2 on the left, we leave Eq. (2b) unchanged.

c) Since Eq. (1) has 1 mol C2H2 on the right, whereas there is 1 mol C2H2 on the left of Eq. (2c) we write Eq. (2c) in reverse.

We then have

/attachments/19ba3a5f-f145-11e9-8682-bc764e2038f2/e7a9addd6207d92984a5161500adb3b4.png

/attachments/19ba3a5f-f145-11e9-8682-bc764e2038f2/0b9965f32f5060d75d127f12e53d94e5.png
/attachments/19ba3a5f-f145-11e9-8682-bc764e2038f2/7f925658aee50bc1f8ae31cb49847935.png

/attachments/19ba3a5f-f145-11e9-8682-bc764e2038f2/58c10a00f24d714b661a4fddbb9b75f1.png

?Hm = (-787.0 -285.8 + 1299.8) kJ

=227.0 kJ

Cancelling 5/2 O2 on each side, the desired result is

2C(s) + H2(g) ? C2H2(g)      ?Hm = 227.0 kJ 

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