m1 (NaCl)чистого в-ва = 251г*0,1 = 25,1г
m2 (NaCl) = 25,1г + 15г = 40,1г
m2 (р-ра) = 251г + 15г = 266г
w2 (NaCl) = (40,1г:266г)*100% = 15,1%
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m1 (NaCl)чистого в-ва = 251г*0,1 = 25,1г
m2 (NaCl) = 25,1г + 15г = 40,1г
m2 (р-ра) = 251г + 15г = 266г
w2 (NaCl) = (40,1г:266г)*100% = 15,1%