设KCl xmol,KBr ymol.
KCl+AgNO3=AgCl+KNO3
xmol xmol
KBr+AgNO3=AgBr+KNO3
ymol ymol
74.5x+119y=3.87g
143.5x+188y=6.63g
解得:x=0.02mol
y=0.02mol
m(KCl)=74.5g/mol ×0.02mol=1.49g
设KCl xmol,KBr ymol.
KCl+AgNO3=AgCl+KNO3
xmol xmol
KBr+AgNO3=AgBr+KNO3
ymol ymol
74.5x+119y=3.87g
143.5x+188y=6.63g
解得:x=0.02mol
y=0.02mol
m(KCl)=74.5g/mol ×0.02mol=1.49g