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narcozzz
@narcozzz
August 2022
1
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помогите пожалуйста, очень срочно.
Массовая доля металла в формуле
W(э) = n * Ar(э)/Mr вещества:
MgBr₂
ZnCl2
Fe(NO3)3
CuSO4
Ca₃(PO₄)₂
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Answers & Comments
Potassiumiodide
1) Mr(MgBr2) = 184
w(Mg) = 24/184×100% = 13,04 %
2) Mr(ZnCl2) = 136
w(Zn) = 65/136×100% = 47,8%
3) Mr(Fe(NO3)3) = 241
w(Fe) = 56/242×100% = 23%
4) Mr(CuSO4) = 160
w(Cu) = 64/160×100 = 40%
5) Mr(Ca3(PO4)2) = 310
w(Ca) = 3*40/310×100% = 38,7%
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Answers & Comments
w(Mg) = 24/184×100% = 13,04 %
2) Mr(ZnCl2) = 136
w(Zn) = 65/136×100% = 47,8%
3) Mr(Fe(NO3)3) = 241
w(Fe) = 56/242×100% = 23%
4) Mr(CuSO4) = 160
w(Cu) = 64/160×100 = 40%
5) Mr(Ca3(PO4)2) = 310
w(Ca) = 3*40/310×100% = 38,7%