Calculate the amount of heat needed to melt 80.1 g of solid hexane (C6H14) and bring it to a temperature of -90.5 °C. Be sure your answer has a unit symbol
and the correct number of significant digits.

Which are causes of mechanical weathering? check all that apply. oacid raino plant growtho animal actionso carbon dioxideo pressure release

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 .

Elements that do not have full outer electron shells will donate, share, or take electrons from other atoms. choose the items that have the correct binary ionic formula.