Question

select the correct answer. 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

Explanation:

Step1: Recall Avogadro's number

Avogadro's number is $6.02\times 10^{23}$ particles per mole. One - mole of any substance contains $6.02\times 10^{23}$ atoms (for elements).

Step2: Understand atomic mass and molar mass relationship

The atomic mass of an element in atomic mass units (amu) is numerically equal to the molar mass of the element in grams per mole. The atomic mass of potassium is 39.1 amu, so the molar mass of potassium is 39.1 g/mol.

Step3: Calculate the mass

The mass of one - mole ($6.02\times 10^{23}$ atoms) of potassium is equal to its molar mass. So the mass of $6.02\times 10^{23}$ atoms of potassium is 39.1 g.

Answer:

B. 39.1 g