What would be the best approximation of the concentration of the reactants after 20 seconds, if the experiment was carried out at 15°C?

What is the overall order of reaction for rate = k[no]2[o2]

Which element is least likely to undergo a chemical reaction

Given the following at 25c calculate delta hf for hcn (g) at 25c. 2nh3 (g) +3o2 (g) + 2ch4 (g) > 2hcn (g) + 6h2o (g) delta h rxn= -870.8 kj. delta hf=-80.3 kj/mol for nh3 (g), -74.6 kj/mol for ch4, and -241.8 kj/mol for h2o (g)