Formula or composition of a named mineral

This type of question, asked 2 times: 15 May 2023 S1, 12 May 2024 S2. All 2 questions below, oldest first.

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Question 1
15 May 2023 S1
93 $What is the number of moles of water molecules present in a mole of carnallite?$
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Question 2
12 May 2024 S2
76 $Which from following formulae is of galena?$
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