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NH3(g)->N2(g)+3/2H2(G)=+45.9KJ(*1/2)and reversed CH4(g)->C(graphite)+2H2(g)=+74.9KJ reversed 1/2H2(g)+C(graphite)+1/2N2(g)-> HCN(g)=+135.1KJ Cancel out C(graphite)and 1/2N2(g) on opposite sides of the reaction. NH3(g)->H2(g)+1/2H2(g)=+45.9KJ (simplified H2(g)with a factor of 3/2 to 1+1/2=3/2) CH4(g)-> 2H2(s)=+74.9KJ 1/2H2(g)->HCN(g)=+135.1KJ cancel out 1/2H2(g) and sum up the reations to obtain. NH3(g)+CH4(g)->HCN+3H2(g)=+225.9KJ

ms sue how did you this? did carter multiply the 40 select marbles by the 20 exactly marbles?

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