NEET 2025 — Chemistry solution

NEET2025Chemistry

Among the following choose the ones with equal number of atoms.

A. 212 g of Na $_{2}$ CO $_{3}$ (s) [molar mass = 106 g]

B. 248 g of Na $_{2}$ O(s) [molar mass = 62 g]

C. 240 g of NaOH(s) [molar mass = 40 g]

D. 12 g of H $_{2}$ (g) [molar mass = 2 g]

E. 220 g of CO $_{2}$ (g) [molar mass = 44 g]

Choose the correct answer from the options given below:

Solution

Number of atoms $= atomicity \times moles \times N_{A}$ .

A. Na $_{2}$ CO $_{3}$ : $6 \times \frac{212}{106} \times N_{A} = 12 N_{A}$ .

B. Na $_{2}$ O: $3 \times \frac{248}{62} \times N_{A} = 12 N_{A}$ .

C. NaOH: $3 \times \frac{240}{40} \times N_{A} = 18 N_{A}$ .

D. H $_{2}$ : $2 \times \frac{12}{2} \times N_{A} = 12 N_{A}$ .

E. CO $_{2}$ : $3 \times \frac{220}{44} \times N_{A} = 15 N_{A}$ .

A, B, and D each give $12 N_{A}$ atoms.

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