Calculate the H for the reaction NO (g) -> 1/2N 2(g) + 1/2O 2(g)
Given the following information:
1/2N 2(g) + O 2(g) -> NO 2(g) H = +33.8 kJ/mol
NO (g) + 1/2O 2(g) -> NO 2(g) H = -56.6 kJ/mol

Which of the following describes a situation where competition between producers exists

An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.

Insoluble sulfide compounds are generally black in color. which of the following combinations could yield a black precipitate? check all that apply. na2s(aq)+kcl(aq) li2s(aq)+pb(no3)2(aq) pb(clo3)2(aq)+nano3(aq) agno3(aq)+kcl(aq) k2s(aq)+sn(no3)4(aq)