Calculate the entropy change in J/mol-K for the reaction: C3H8(g) + 5O2(g) ---> 3CO2(g) + 4H2O(g)

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 .

The wave shown on the electromagnetic spectrum disturb the medium it passes through a)different frequency. b)the same frequency .

This drawing shows a human body system. what is the primary function of this body system?