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salomatkin
@salomatkin
September 2021
1
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Вычислите содержание (в %) каждого элемента в соединениях, формулы которых:а) СаSO4, 2H2O, б)KNO3 в)NH4K2PO4
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Antaresa
W =
* 100%
а) Mr(CaSO4) =136
w(Ca) =
* 100% = 29,41%
w(S) =
* 100% = 23,53%
w(O) =
* 100% = 47,06%
2H2O
Mr(H2O) = 18
w(H) =
* 100% = 11,11%
w(O) =
* 100% = 88,89%
б) KNO3
Mr(KNO3) = 101
w(K) =
* 100% = 38,6%
w(N) =
* 100% = 13,9%
w(O) =
* 100% = 47,5%
в) NH4K2PO4
Mr(NH4K2PO4) = 191
w(N) =
* 100% = 7,3%
w(H) =
* 100% = 2,1%
w(K) =
* 100% = 40,8%
w(P) =
* 100% = 16,2%
w(O) =
* 100% = 33,5%
4 votes
Thanks 10
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Answers & Comments
а) Mr(CaSO4) =136
w(Ca) = * 100% = 29,41%
w(S) = * 100% = 23,53%
w(O) = * 100% = 47,06%
2H2O
Mr(H2O) = 18
w(H) = * 100% = 11,11%
w(O) = * 100% = 88,89%
б) KNO3
Mr(KNO3) = 101
w(K) = * 100% = 38,6%
w(N) = * 100% = 13,9%
w(O) = * 100% = 47,5%
в) NH4K2PO4
Mr(NH4K2PO4) = 191
w(N) = * 100% = 7,3%
w(H) = * 100% = 2,1%
w(K) = * 100% = 40,8%
w(P) = * 100% = 16,2%
w(O) = * 100% = 33,5%