Find the limiting reactant for each initial amount of reactants in the following reaction: 2Na(s) + Br2(g) + 2NaBr(s)

Part A: 3 mol Na and 3 mol Br2
Part B: 1.6 mol Na and 1.2 mol Br2
Part C: 2.5 mol Na and 1 mol Br2
Part D: 12.9 mol Na and 6.9 mol Br2

Express your answers as a chemical formula.
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What is the value of keq for the reaction expressed in scientific notation

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