How many moles are represented by 2.5 × 10¹⁵ Na atoms? A) 3.8 × 10^-10 mol B) 1.8 × 10^-10 mol C) 1.5 × 10³⁹ mol D) 4.2 × 10^-9 mol E) 1.1 × 10¹⁴ mol

Question

Quizplus · Accepted Answer

The number of moles of Na atoms can be calculated using Avogadro's number, which is 6.022 × 10²³ atoms/mol. Therefore, 2.5 × 10¹⁵ Na atoms is equal to 2.5 × 10¹⁵ atoms / (6.022 × 10²³ atoms/mol) = 4.2 × 10^-9 mol.

How Many Moles Are Represented by 2