Question

How many moles of nh3 contain 1.75 x 1024 molecules?

Answer 1

2.91 moles NH₃

Step-by-step explanation:

To find the answer, you need to use Avogadro's number to convert between molecules and moles. It is important to arrange the ratio/conversion in a way that allows for the cancellation of units. The final answer should have 3 sig figs because the given value (1.75) also has 3 sig figs.

Avogadro's Number:

6.022 x 10²³ molecules = 1 mole

1.75 x 10²⁴ molecules NH₃ 1 mole
-------------------------------------- x ------------------------------------ = 2.91 moles NH₃
6.022 x 10²³ molecules