What mass of iron would be need 1450 cal of energy in order to raise its temperature by 19.7 degrees celsius

If an area has high air pressure and low humidity, what type of weather will it most likely have? plz !

Consider the reaction: n2(g) + o2(g) ⇄ 2no(g) kc = 0.10 at 2000oc starting with initial concentrations of 0.040 mol/l of n2 and 0.040 mol/l of o2, calculate the equilibrium concentration of no in mol/l how would this be done?

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?