Calculate the reaction quotient, Q, for the following cell reactions, given the measured values of the cell potential. Balance the chemical equations by using the smallest whole-number coefficients.

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4+ (a) Pt(s) Sn¹+ (aq),Sn²+ (aq)||Pb¹+ (aq),Pb²+(aq) |C(gr), Ecell +1.33 V. (b) Pt(s) O₂(g) H¹(aq)||Cr₂O7²(aq),H+ (aq),Cr³+ (aq)|Pt(s), Ecell +0.10 V. = =