V (NaCl) - 250мл = 0,25 л
M(NaCl) - 0.4
C=n/V => 0.4 = X/0.25
0.4*0.25=0.1 моль
m(NaCl) = n*M = 0.1*58.5= 5.85г
V (NaCl) - 250мл = 0,25 л
M(NaCl) - 0.4
C=n/V => 0.4 = X/0.25
0.4*0.25=0.1 моль
m(NaCl) = n*M = 0.1*58.5= 5.85г