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Molecular Mass

In an ionic c...

Question

In an ionic compound, mole ratio of cation to anion is $1 : 2$ . If atomic masses of metal and non-metal respectively are 138 and 19, then correct statement is :

A

molecular mass of compound is 176

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B

formula mass of compound is 176

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C

formula mass of compound is 157

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D

molecular mass of compound is 157

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Solution

The correct option is D formula mass of compound is 176
1 mole of ionic compound contains 1 mole of cations and 2 moles of anions.
The formula mass of the compound is $138 + 2 (19) = 176 g / m o l$ .

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