Bài 3.\(a.n_{CaCO_3}=\dfrac{7,5}{100}=0,075\left(mol\right)\\ CaCO_3+2HCl\rightarrow CaCl_2+CO_2+H_2O\\ b.n_{HCl}=2n_{CaCO_3}=0,15\left(mol\right)\\ \Rightarrow m_{ddHCl}=\dfrac{0,15.36,5}{7,3\%}=75\left(g\right)\\ c.n_{CO_2}=n_{CaCO_3}=0,075\left(mol\right)\\ m_{ddsaupu}=m_{CaCO_3}+m_{ddHCl}-m_{CO_2}=7,5+75-0,075.44=79,2\left(g\right)\\ n_{CaCl_2}=n_{CaCO_3}=0,075\left(mol\right)\\ \Rightarrow C\%_{CaCl_2}=\dfrac{0,075.111}{79,2}.100=10,51\%\)
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