Be sure to answer all parts. Determine Kb of the benzoate ion (C6H5COO−). [Ka of benzoic acid (C6H5COOH) = 6.5 × 10−5.] Please report your answer to the correct number of significant figures.

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?