沉淀0.27g为CaCO3
CaCl2——CaCO3
111 100
x 0.27
解得CaCl2=0.3g(0.2997g) mCaCl2%=6%
2NaBr+Cl2=2NaCl+Br2
则Br2-Cl2=5-4.914=0.086g
mNaBr=0.086/(80-35.5)*103=0.2g mNaBr%=4%
则mNaCl=90%
这道题我们化学作业半个月前刚刚做过
沉淀0.27g为CaCO3
CaCl2——CaCO3
111 100
x 0.27
解得CaCl2=0.3g(0.2997g) mCaCl2%=6%
2NaBr+Cl2=2NaCl+Br2
则Br2-Cl2=5-4.914=0.086g
mNaBr=0.086/(80-35.5)*103=0.2g mNaBr%=4%
则mNaCl=90%
这道题我们化学作业半个月前刚刚做过