Question

Calculate Delta n (change in moles of gaseous substances) for each of the following balanced chemical equations...
2C6H6O(l)+17O2−−>12CO2(g)+12H2O(l)
2SO2(g)+O2(g)−−>2SO3(g)
N2(g)+O2(g)−−>2NO(g)
2Na(s)+Br2(l)−−>2NaBr(s)

Answer 1

2C6H6O(l)+17O2−−>12CO2(g)+12H2O(l)
2SO2(g)+O2(g)−−>2SO3(g)
N2(g)+O2(g)−−>2NO(g)
2Na(s)+Br2(l)−−>2NaBr(s)
On the 1st 3 I have
12 -17 = -5
2 - 3 = -1
2 - 2 = 0
For the last one:
Delta n=0