Question

The molecular mass of ${\text{NaHCO}}_3$ is .

• A. Cations
• B. Anions
• C. Molecules

Answer 1

The correct option is C Molecules

Molecular mass of any molecule is equal to the sum of the masses of its constituent atoms.
Atomic mass of hydrogen = 1 u
Atomic mass of sodium = 23 u
Atomic mass of carbon = 12 u
Atomic mass of oxygen = 16 u

Therefore, the molecular mass of $NaH{CO}_3$
= $(1\times Atomicmassofsodium)+(1\times Atomicmassofhydrogen)+(1\times Atomicmassofcarbon)+(3\times Atomicmassofoxygen)$

= $(1\times 23)+(1\times 1)+(1\times 12)+(3\times 16)$
= 23 + 1 + 12 + 48
= 84 u