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Nini102
@Nini102
July 2022
1
6
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ХИМИЯ. 7 КЛАСС.
Вычислите массовые доли всех элементов в веществах:
P2O5
Na2SO4
K3PS4
Ca(NO3)2
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Answers & Comments
Александра3222
1)P2O5
W(P)=(100%:71)*31=43,66%;
W(O)=(100%:71)*40=56,34%
2)
Na2SO4
w(Na)= ((23*2)/ 142)* 100%=
32%;
w(S)= ((32*1)/142) *100%=
23%;
w(O)= ((16*4)/ 142) *100%=
45%
3)
K3PS4
w(K)=((39*3)\276)*100=42.4%
w(P)=
((31*1)\276)*100=11.2%
w(S)=
((32*4)\276)*100=46.3%
4)
Ca(NO3)2
w(Ca)=((40*3)\164)*100=41.8%
W(N)=((2*14)/164)*100%=17%
W(O)=((2*16)/164)*100%=41.2%
2 votes
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Answers & Comments
W(P)=(100%:71)*31=43,66%;
W(O)=(100%:71)*40=56,34%
2)Na2SO4
w(Na)= ((23*2)/ 142)* 100%= 32%;
w(S)= ((32*1)/142) *100%= 23%;
w(O)= ((16*4)/ 142) *100%= 45%
3)K3PS4
w(K)=((39*3)\276)*100=42.4%
w(P)=((31*1)\276)*100=11.2%
w(S)=((32*4)\276)*100=46.3%
4)Ca(NO3)2
w(Ca)=((40*3)\164)*100=41.8%
W(N)=((2*14)/164)*100%=17%
W(O)=((2*16)/164)*100%=41.2%