\(n_{SO_3}=\dfrac{80}{80}=1mol\\ m_{H_2SO_4\left(bđ\right)}=1000\cdot1,2\cdot10\%=120g\\ SO_3+H_2O->H_2SO_4\\ C_{\%}=\dfrac{120+98}{1000\cdot1,2+80}\cdot100\%=17,03\%\)
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