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@X@user.full_name@X@ @GMU: What is the empirical formula of a compound if its percent composition is 49.29% C and 9.653% H and 19.16% N ? The compound contains only C, H, N and O.

@X@user.full_name@X@ @GMU: Which of the following is a mixture?

@X@user.full_name@X@ @GMU: A flexible container was filled with CO gas at a pressure of 1.955 atm and volume of 18.399 L. What volume would this same gas occupy if the pressure increased to 4.686 atm? Assume temperature is constant.

@X@user.full_name@X@ @GMU: What is the free energy change for the reaction below, if the reaction quotient, Q, at 25.0oC is equal to 7.92e-5?5C2H2(g) + 7 H2(g) → C10H24(g) ΔGo = -908.030 kJ.

@X@user.full_name@X@ @GMU: Kaolinite, a clay mineral with the formula Al4Si4O10(OH)8, is produced naturally by the chemical weathering of aluminum silicate minerals like feldspar (granite). Kaolinite is used industrially as filler in slick-paper for magazines and as a raw material for ceramics. How many grams of oxygen are present in 16.64 g of kaolinite?

@X@user.full_name@X@ @GMU: Which of the following would require an oxidizing agent to occur?

Ammonia, NH3, can be prepared by the reaction below. What is the correct equilibrium constant expression, Kc, for this reaction?N2(g) + 3H2(g) ⇋ 2NH3(g)

@X@user.full_name@X@ @GMU: What is the entropy change for the reaction below, if the standard entropies of reactants and products are So(C(gr)) = 5.74 J/mol*K, So(H2(g)) = 130.68 J/mol*K, and So (C6H6(g)) = 269.200 J/mol*K.6C(gr) + 3H2(g) → C6H6(g)

@X@user.full_name@X@ @GMU: Balance the reaction below; determine the sum of the coefficients; this is in an acidic solution! Include co-efficients for any unshown species (such as water and H+)._MnO4- + _H2 → _Mn2+ + _H+

@X@user.full_name@X@ @GMU: What is the standard cell voltage at 25.0oC for the reaction below?Cr3+(aq) + Al(s) → Cr(s) + Al3+(aq) K = 3.75e39