The mass of a single gold atom is 3.27×10-22 grams. how many gold atoms would there be in 43.2 milligrams of gold?

There are 1.32 × 10²⁰ atoms in 43.2 mg of gold.

Step 1. Convert grams of Au to moles of Au

Moles of SF₆ = 0.0432 g Au × (1 mol Au/196.97 g Au) = 2.193 × 10⁻⁴ mol Au

Step 2. Convert moles of Au to atoms of Au.

Atoms of Au = 2.193 × 10⁻⁴ mol Au × (6.022 × 10²³ atoms Au /1 mol Au)

= 1.32 × 10²⁰ atoms Au

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.

you need to stop taking that class