Consider the following reaction in a sealed vessel kept at constant temperature: A(g)  ⇌  2B(g) If the reaction is started with 2.0 mol of A and no B, the amount of B at equilibrium is 2.4 mol. How many moles of A should one start with to obtain 4.8 mol of B at equilibrium under the same conditions (same vessel, same temperature, no gas B present initially)?   A.  5.0 mol   B.  5.6 mol   C.  4.0 mol   D.  6.5 mol   E.  6.0 mol

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