参考答案:C
60,52.8
55,58.7
50,43.6
40,35.1
反应前后质量守恒:
W=12+48=60 (kg)
氧气过量;
W(CO2)=12×0.9×44×2/30=31.68(kg)
W%=31.68/60=0.528=52.8%
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