Question

How many uranium atoms are present in 1.2 moles of uranium metal? Give your answer in scientific notation.

- A. (2.27 × 10²⁴)
- B. (3.81 × 10²⁴)
- C. (4.83 × 10²³)
- D. (7.20 × 10²³)

Answer 1

To find the number of uranium atoms in 1.2 moles of uranium metal, multiply the number of moles by Avogadro's number. The calculation yields 7.224 × 10²³ atoms, which is closest to option D. (7.20 × 10²³).

Step-by-step explanation:

The number of uranium atoms present in 1.2 moles of uranium metal can be calculated using Avogadro's number, which is 6.02 × 10²³ atoms per mole. To find the total number of atoms in 1.2 moles, you multiply the number of moles by Avogadro's number:

(1.2 moles) × (6.02 × 10²³ atoms/mole) = 7.224 × 10²³ atoms

This value is closest to option D. (7.20 × 10²³), so the correct answer is:

D. (7.20 × 10²³)