What is the mass,in grams,of one arsenic atom? (N_A = 6.022 × 10²³ mol^-1)

Question

Quizplus · Accepted Answer

The molar mass of arsenic (As) is 74.92 g/mol. Therefore, one mole of arsenic atoms weighs 74.92 g.

To find the mass of one arsenic atom, we can divide the molar mass by Avogadro's number (6.022 × 10²³ atoms/mol):

74.92 g/mol ÷ 6.022 × 10²³ atoms/mol = 1.24 × 10⁻²² g/atom

Therefore, the mass of one arsenic atom is 1.24 × 10⁻²² g, which is closest to answer choice D.

What Is the Mass,in Grams,of One Arsenic Atom? (NA =