How many atoms are present in 2 moles of sodium atoms?

medium 2 marks Class 9 · Science · Atoms and Molecules

Answer

1.204×10^24

The correct answer is 1.204×10^24 — Therefore, 2 moles of sodium contain $1.204 \times 1 0^{24}$ atoms.

Step-by-step solution

Recall Avogadro’s number: $N_{A} = 6.022 \times 1 0^{23}$ atoms per mole.
Multiply the number of moles by Avogadro’s number: $2 \times 6.022 \times 1 0^{23} = 1.2044 \times 1 0^{24}$ atoms.
Round the result to three significant figures: $1.204 \times 1 0^{24}$ atoms.
Therefore, 2 moles of sodium contain $1.204 \times 1 0^{24}$ atoms.

Common mistake: Using the wrong Avogadro constant or misplacing the exponent of 10.

Concept tested: Atom count from moles