Question

which of the following contains the highest number of atoms? answer: a 1 mole of helium b 1 mole of carbon c 1 mole of uranium d all contain an equal number of atoms e not enough info

Explanation:

Step1: Recall Avogadro's number

1 mole of any substance contains \( N_A = 6.022\times 10^{23} \) entities (atoms, molecules, etc.).

Step2: Analyze each option

• Option A: 1 mole of helium (He) has \( 6.022\times 10^{23} \) He atoms (He is monoatomic).
• Option B: 1 mole of carbon (C) has \( 6.022\times 10^{23} \) C atoms.
• Option C: 1 mole of uranium (U) has \( 6.022\times 10^{23} \) U atoms.
• So, 1 mole of each monoatomic element has the same number of atoms.

Answer:

D. All contain an equal number of atoms