Why is it easy for some elements to lose electrons and harder for others?

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.

What is the formula of the ionic compound composed of calcium cations and chloride anions

How many moles of water are created if 3 moles of hydrogen react completely with excess oxygen?