# chemistry

sodium reacts completely with 0.142kg of chlorine, forming 234g of sodium chloride. What mass of sodium reacted?

I know that for chemical changes the amounts should end up being equal, but I don't know how to set up the problem.

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3. 👁 3,216
1. It is the number of atoms, or moles, of Na which is equal to the number of atoms, or moles, of Cl in NaCl
Na = 23 grams/mol
Cl = 35.5 grams/mol

NaCl = 58.5 grams/mol

so if we ended up with 234 grams ofNaCl, that was 4 mols of NaCl

That requires 4*23 = 92 grams of Na
and
That requires 4*35.5 = 142 grams of Cl, sure enough

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2. 92.0

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3. 92 is the correct answer.

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4. 124

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2. 👎 1

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