\(CaC_2+2H_2O\rightarrow Ca\left(OH\right)_2+C_2H_2\\ n_{CaC_2}=n_{C_2H_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\\ m_{CaC_2}=64.0,05=3,2\left(g\right)\\ \%m_{\dfrac{CaC_2}{đất.đèn}}=\dfrac{3,2}{4}.100\%=80\%\)
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