<span>Li<span>, </span>Rb<span>, </span>K<span>, </span>Ba<span>, </span>Sr<span>, </span>Ca<span>, </span>Na<span>, </span>Mg<span>, </span>Al<span>, </span>Mn<span>, </span>Zn<span>, </span>Cr<span>, </span>Fe<span>, </span>Cd<span>, </span>Co<span>, </span>Ni<span>, </span>Sn<span>, </span>Pb</span><span>, </span><u>H</u><span>, </span><span>Sb<span>, </span>Bi<span>, </span>Cu<span>, </span>Hg<span>, </span>Ag<span>, </span>Pd<span>, </span>Pt<span>, </span><span>Au слева направо уменьшается активность </span></span>
W( FeSO3) = 1000 x 0,6 = 600г
w (Fe) = 56/136 =0,4
m ( Fe) = 600 x 0,4 = 240г
M(p-pa NaCl) = 50 г + 15 г = 65 г
ω(NaCl) = m(NaCl)÷m(p-pa NaCl)
ω(NaCl) = 15 г/65 г = 0,2308, или 23,08%
Ответ: 23,08%