At 20 c an aluminum ring has an inner diameter of 5.000 cm, and abrass rod has a diameter of 5.050 cm. keeping the brass rodat 20 c, what temperature of the ring will allow the ring to justslip over the brass rod? (αal = 2.4 x 10^-5/c) (αbrass = 1.9 x10^-5/c)
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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 .

Calculate the number of molecules present in 0.750 mol of mgo.

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