Based on the following data, what is the standard Gibbs free energy of formation of the sulfate ion at 298 K? ( R = 8.31 J/(K ∙ mol)) PbSO4(s) Pb2+(aq) + SO42–(aq); Ksp = 1.7 × 10–8

Substance ΔG°f (kJ/mol) at 298 K
Pb2+(aq)
–24.4

PbSO4(s)
–813.0
a. –788.6 kJ/mol

b. –793.1 kJ/mol

c. –837.4 kJ/mol

d. –744.3 kJ/mol

e. 832.9 kJ/mol

During chemistry class, carl performed several lab tests on two white solids. the results of three tests are seen in the data table. based on this data, carl has concluded that substance b must have bonds.

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

Cryolite, na3alf6(s), an ore used in the production of aluminum, can be synthesized using aluminum oxide. start this question by first balance the chemical equation.1.) balance the equation: - alo3(s)+naoh(l)+hf(> na3alf6+h2o(g). 2.) if 17.5 kilograms of al2o3(s), 51.4 kilograms of naoh(l), and 51.4 kilograms of hf(g) react completely, how many kilograms of cryolite will be produced? 3.)which reactants will be in excess, (al2o3, naoh, or hf) 4.)what is the total mass of the excess reactants left over after the reaction is complete in kg?