常温下，向20 L的真空容器中通入a mol H2S和b mol SO2（a和b都是正整数，且a≤5，b≤5）。反应完全后，容器内气体可能达到的最大密度是（ ）
| A．24.5 g/L | B．14.4 g/L | C．8 g/L | D．5.19 g/L |
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