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What is the number of unit cells in 936 ...

What is the number of unit cells in 936 amu of sodium chloride ?

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One unit cell of NaCl contains 4 formula units
`:.` Mass of one unit cell `=58.5 xx 4"amu"`
No. of unit cell in 936 amu `=(936"amu")/(58.5xx4"amu")=4`
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