The molar mass of calcium is 40.08, oxygen is 16.0, and hydrogen is 1.01. what is the mass of one mole of calcium hydroxide (ca(oh)2)?

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 .

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

Adepositional also feature that forms where a stream enters a lake or an ocean is a