(B) Sodium chloride $(NaCl)$ is an ionic compound that exists as a continuous crystal lattice,not as discrete molecules. Therefore,the term 'molecular

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(B) Sodium chloride $(NaCl)$ is an ionic compound that exists as a continuous crystal lattice,not as discrete molecules. Therefore,the term 'molecular mass' is not applicable to it. Instead,we use the term 'formula mass'. The formula mass of $NaCl$ is calculated as the sum of the atomic masses of $Na$ $(23 \ amu)$ and $Cl$ $(35.5 \ amu)$. Formula mass $= 23 + 35.5 = 58.5 \ amu$.

Class 11 Chemistry Some Basic Concepts of Chemistry Atomic, Molecular and Equivalent masses

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Which of the following is true about sodium chloride?

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A
Molecular mass $= 58.5 \ amu$
B
Formula mass $= 58.5 \ amu$
C
Molecular mass $= 5.85 \ amu$
D
Formula mass $= 5.85 \ amu$

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Some Basic Concepts of Chemistry

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Atomic, Molecular and Equivalent masses

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Which of the following is true about sodium chloride?

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The equivalent weight of $H_3PO_4$ in the reaction is $Ca(OH)_2 + H_3PO_4 \to CaHPO_4 + 2H_2O$
$(Ca = 40, P = 31, O = 16)$