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74 g magnesium (1 mole Mg/24.31 g)(6.022 X 1023/1 mole Mg)(1 mole Mg atoms/6.022 X 1023)

= 3.0 moles of magnesium atoms

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As you see Avogadro's number is over itself as a form of one, so only the moles of Mg need be found. This depiction is the formal set up.

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12y ago
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14y ago

water = 18.0 g / mole

7.5 g of water = 2.508*10^23

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12y ago

In 7.6 mole MgS there is 7.6 mole Mg(2+) AND 7.6 mole S(2-)

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14y ago

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Q: How many grams are in 7.40 moles of magnesium hydroxide?
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