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Problem
How many monovalent oxygen atoms are present in the mineral kinoite
(
Ca
2
+
2
Cu
2
+
2
Si
3
O
10
⋅
2
H
2
O
)
(\text{Ca}_2^{+2} \text{Cu}_2^{+2} \text{Si}_3\text{O}_{10} \cdot 2\text{H}_2\text{O})
(
Ca
2
+
2
Cu
2
+
2
Si
3
O
10
⋅
2
H
2
O
)
?
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