Question

Assertion :Formula mass (in grams)of magnesium chloride has $12.044\times {10}^{23}$ magnesium ions.
Reason: One formula mass of an ionic compound has $6.022\times {10}^{23}$ ions of each type.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is D Both Assertion and Reason are incorrect

Formula mass if a molecule is the sum of the atomic weights of atoms in the empirical formula.

Therefore, Formula mass $=$ Mass of $1$ molecule in grams. Also, $1$ molecule has $NA$ number of ions i.e $6.022\times$${10}^{23}$ ions. Formula mass of Magnesium chloride $\left(MgC{l}_2\right)$ has $6.022\times {10}^{23}$ ions.