A Nernst calculator

You will write three functions. One builds the reaction quotient from concentrations and coefficients. One applies the Nernst equation at any temperature. The last turns a measured emf back into a reaction quotient.

The idea. $Q$ is the product of the concentrations of the products, each to the power of its coefficient, divided by the same for the reactants. Then $E = E^\circ - \dfrac{2.303RT}{nF}\log Q$.

Your tasks.

1. Complete reaction_quotient(products, reactants). Each argument is a list of pairs (concentration, coefficient). Solids and pure liquids are not in the lists.
2. Complete nernst(e0, n, q, temp=298) so that it returns the emf in volts.
3. Complete quotient_from_emf(e0, n, e, temp=298) so that it returns the $Q$ that gives the emf e.