Saturday
October 25, 2014

Homework Help: Chemistry Urgent

Posted by David on Sunday, March 9, 2014 at 10:28pm.

Consider the following problem:



Target: 2NOCl(g) ? N2(g)+ O2(g)+Cl2 (g) ?Hrxn= ?

Steps:

1. 1/2 N2(g) + 1/2 O2(g)? NO(g) ?H= 90.3 kJ

2. NO(g) + 1/2 Cl2(g) ? NOCl(g) ?H= -38.6 kJ

As you determine the Hrxn value for the target equation above, what must be done to step 2?


Question options:


a. Step 2 requires no change


b. Step 2 should be only multiplied by 2


c. Step 2 should be reversed and multiplied by 1/2.


d. Step 2 should be reversed and multiplied by 2.


e. Step 2 should be only reversed

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