Question

И ОПЯТЬ Я В ПЛЕНУ!!!!!!!! Тоько по химии!!!!!!!

Answer 1

1 A

Fe(OH)3

w(O)=(48/107)×100%=44.85%

2 A

Cu3(PO4)2

w(Cu)=(192/382)×100%=50.26%

w(P)=(62/382)×100%=16.23%

w(O)=(128/382)×100%=33.51%

3 Г

Al2O3

w(Al)=(54/102)×100%=53%

w(O)=(48/102)×100%=47%

4 В

5 1-Г, 2-В, 3-Д, 4-1

HCl

w(H)=(1/36.5)×100%=2.74%

NH3

w(H)=(3/17)×100%=17.76%

PH3

w(H)=(3/34)×100%=8.82%

H2O

w(H)=(2/18)×100%=11.11%