Question

The atomic mass of potassium is 39.1. What is the mass of 6.02 × 1023 atoms of potassium?
A.
39.1 mg
B.
39.1 g
C.
39.1 kg
D.
6.02 × 39.1 mg
E.
6.02 × 39.1 g

Answer 1

To determine the mass of \(6.02 \times 10^{23}\) atoms of potassium, we can use the following relationships:

1. The atomic mass of potassium (K) is 39.1 g/mol. This means that one mole of potassium (which contains \(6.02 \times 10^{23}\) atoms) has a mass of 39.1 grams.
2. Since \(6.02 \times 10^{23}\) atoms corresponds to 1 mole of potassium, the mass of these atoms is simply the mass of one mole of potassium.

Thus, the mass of \(6.02 \times 10^{23}\) atoms of potassium is:

\[
39.1 \text{ g}
\]

Therefore, the correct answer is **B. 39.1 g**.