What is the hydronium ion concentration and the ph for an aqueous solution of nh3 that has a hydroxide ion concentration of 2.25 × 10- 2 m?

Nitric oxide (no) can be formed from nitrogen, hydrogen and oxygen in two steps. in the first step, nitrogen and hydrogen react to form ammonia: n2(g) + 2 h_2(g) rightarrow 2 nh_3 (g) delta h = -92. kj in the second step, ammonia and oxygen react to form nitric oxide and water: 4 nh_3(g) + 5 o_2(g) rightarrow 4no(g) + 6 h_2o(g) delta h = -905. kj calculate the net change in enthalpy for the formation of one mole of nitric oxide from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .

At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure

Find the number of moles of argon in 364g of argon.