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May 28, 2015

Homework Help: Chemistry

Posted by Amy on Monday, June 20, 2011 at 7:22am.

Hi this is a repost, and I have another 2 questions I posted yesterday. Please help me with these, I need help to verify my work, not confident if I'm doing these right.

Use oxidation numbers to identify if this reaction is REDOX reactions.

3NO2(g) + H2O(l) �� 2HNO3(aq) + NO(g)

3NO2 = -3 for N
= -2 for o2

H2O = +1 for H2
= -2 for O

---->

2HNO3 = +1 for 2H
= -3 for N
= -2 for O3

NO = -3 for N
= -2 for O

Therefore Nitrogen is reduced (one -3 remains on right side)
hence REDOX has occured


Is this right? Also should I be multiplying oxidation numbers if there is a number in front ie. 2SO = -2 oxidation but should I multiply by the 2 infront so is now -4 oxidation for sulphur in 2SO? Please let me know because I haven't done this and if wrong need to correct for a lot of questions :(

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