Ответ:
а) H₂O, Mr = 18: W(H) = 2/18·100% = 11,11%; W(O) = 16/18·100% = 88,89%.
б) H₂SO₄, Mr = 98: W(H) = 2,04%; W(S) = 32,65%; W(O) = 65,31%.
в) HNO₃, Mr = 63: W(H) = 1,59%; W(N) = 22,22%; W(O) = 76,19%.
а) H₂O, Mr = 18: W(H) = 2/18·100% = 11,11%; W(O) = 16/18·100% = 88,89%.
б) H₂SO₄, Mr = 98: W(H) = 2,04%; W(S) = 32,65%; W(O) = 65,31%.
в) HNO₃, Mr = 63: W(H) = 1,59%; W(N) = 22,22%; W(O) = 76,19%.