Đáp án:
Giải thích các bước giải:
ta có
C%=mct\mdd. 100
20=40\mdd .100
=>mdd =200g
=> khối lượng nước cần pha chế là 200-40=160g
mdd=40.100/20=200g
mH2O=200-40=160g
Vậy khối lượng nước cần dùng sự pha chế là 160g
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