Pls help (100 points) Given these reactions:

NO (g) + O3 (g)→NO2 (g) + O2(g), ΔH =−199 kJ

O3 (g)→32O2 (g), ΔH =−142 kJ

O2 (g)→2O (g), ΔH =+495 kJ

What is the ΔH for this reaction?

NO (g) + O (g)→NO2 (g)

−304 kJ

−199 kJ

+154 kJ

+438 kJ

If you add 10ml of hot water to 10ml of cold water and the change in tempature 8°c calculate how much energy is gained by the cold water

Consider the elements bromine and chlorine; which elements has a larger ionic radius ?

In 1901, thomas edison invented the nickel-iron battery. the following reaction takes place in the battery. fe(s) + 2 nio(oh)(s) + 2 h2o(l) fe(oh)2(s) + 2 ni(oh)2(aq) how many mole of fe(oh)2, is produced when 5.35 mol fe and 7.65 mol nio(oh) react?