1.Определить валентность элементов в веществах:
Na20; 02; H2SO4; N2; S; H2O; Al; Cu: HNO3; F2; Cа.
Na20; 02; H2SO4; N2; S; H2O; Al; Cu: HNO3; F2; Cа.
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Ответ:
Na²O= 62
H²SO⁴= 101
N²=30
S=33
H²O=20
Al=27
Cu=64
HNO³=20
F²=19
Ca=41
Объяснение:
Na²O= 2×23+1×16=46+16=62
H²SO⁴= 2×2+1×33+4×16=4+33+64=101
N²=2×15=30
S=1×33=33
H²O=2×2+1×16=4+16=20
Al=1×27=27
Cu=1×64=64
HNO³=1×2+1×15+3×16=2+15+48=65
F²=1×19=19
Ca=1×41=41