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【简答题】
将等物质的量的A、B混合于2L的密闭容器中发生如下反应：3A（g）+B(g) nC(g) +2D(g),经过5min后，测得D的浓度为0.5mol/L，c(A):c(B)=3:5,C的平均反应速率为0.1mol/(L.min). 则（1）n= ；(2)反应开始前容器中B的物质的量为 mol； (3)5min时A的转化率是 。
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