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18.066 X 1023 atoms of Na will represent how many grams of Na? Group of answer choices1 gram107.5 grams56 grams96 grams69 grams

User Tuffwer
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1 Answer

3 votes

1) Convert atoms to moles

Avogadro's number is 6.022*10^23


molNa=18.066\cdot10^(23)atomsofNa\cdot\frac{1molNa^{}}{6.022\cdot10^(23)atoms_{}ofNa}^{}=3molNa_{}

2) Convert moles to grams

The molar mass of Na is 22.990 g/mol


gNa_{}=3molNa\cdot\frac{22.990_{}gNa}{1molNa_{}}_{}=68.97gNa_{}

There are 18.066*10^23 atoms of Na in 69 grams of Na.

User Jedigo
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