Question

2. How many moles are in 7.30 X 10^23 molecules of NaCl?

Answer 1

`\huge{ \boxed{1.213 \: \text{moles}}}`

Step-by-step explanation:

To find the number of moles in a substance given it's number of entities we use the formula

`\bold{n = (N)/(L)} \\`

where

• n is the number of moles
• N is the number of entities
• L is the Avogadro's constant which is 6.02 × 10²³ entities

From the question

N = 7.30 × 10²³ NaCl molecules

`n = \frac{7.30 * {10}^(23) }{6.02 * {10}^(23) } = (7.30)/(6.02) \\ = 1.2126`

We have the final answer as

1.213 moles