How many gold atoms are in a 0.491 ounce, 18 K gold bracelet? (18 K gold is 75% gold by mass.)

At room temperature what happens to the average kinetic energy of the molecules of a solid, liquid, and a gas

Amixture initially contains a, b, and c in the following concentrations: [a] = 0.300 m , [b] = 1.05 m , and [c] = 0.550 m . the following reaction occurs and equilibrium is established: a+2b⇌c at equilibrium, [a] = 0.140 m and [c] = 0.710 m . calculate the value of the equilibrium constant, kc.

Is this correct if not can u correct me