How Many Atoms Are Present in a Sample of Pure

question 18

Multiple Choice

How many atoms are present in a sample of pure iron with a mass of 260 g? (The atomic mass of iron = 56 and N_A = 6.02 × 10²³)

• A) 3.9 × 10¹⁹
• B) 15.4 × 10²²
• C) 5.8 × 10²⁸
• D) 7.7 × 10²⁴
• E) ​9.6× 10²⁴

---

Definitions:

Longevity

The length of time that an individual lives, often used in context of factors that contribute to a long life.

Life Span

The longest period that members of a species can live.

Life Expectancy

The average period that an individual is expected to live, based on statistical analysis.

Increased

Describes something that has grown or risen in number, size, quantity, or degree.