Question

How many moles are there in 34.5 g of sodium? (Atomic mass of sodium = 23u)

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Answer 1

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1 mole of atom = Gram Atomic mass

1 mole of sodium = 23g

So, 34.5 g of sodium = mass of element in grams/gram atomic mass of element

= 34.5/23

= 1.5mol

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Answer 2

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• 1 mole of atom =gram atomic mass
• 1 mole of sodium=23g
• so 34.5 g of sodium=mass of element/gram atomic mass
• =34.5/23
• =1.5 moles

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