Объяснение:
1) C(II)O(II), C(IV)O(II), C(IV)H(I), Cl(I)O(II), Cr(VI)O(II), Cr(II)Cl(I)
2) AlBr3, Cr2O3, Mg3P2, Al2S3, SiO2
3) MgO, CuO, ZnO, BeF2
4) Mr(CH4) = 12+1*4 = 16
W(C) = Ar(C) *n / Mr(CH4) *100% = 12 *1 / 16 *100% =75%
W(H) = Ar(H) *n / Mr(CH4) *100% = 1*4 / 16 *100% = 25%
Объяснение:
1) C(II)O(II), C(IV)O(II), C(IV)H(I), Cl(I)O(II), Cr(VI)O(II), Cr(II)Cl(I)
2) AlBr3, Cr2O3, Mg3P2, Al2S3, SiO2
3) MgO, CuO, ZnO, BeF2
4) Mr(CH4) = 12+1*4 = 16
W(C) = Ar(C) *n / Mr(CH4) *100% = 12 *1 / 16 *100% =75%
W(H) = Ar(H) *n / Mr(CH4) *100% = 1*4 / 16 *100% = 25%