The following reaction is spontaneous as written when the components are in their standard states:
3Zn(s) + 2Cr³⁺(aq) -> 3Zn²⁺(aq) + 2Cr(s)
Part A: If the Zn²⁺ concentration is 3 mol/L, determine the value of:

a) [Cr³⁺]
b) [Zn(s)]
c) [Cr(s)]
d) [Zn²⁺]