Question

A sample of phosphorus contains 1.38e24 atoms. How many moles of phosphorus is this?

2.3 grams
0.44 grams
2.3 moles
0.44 moles

Answer 1

2.3 moles

Step-by-step explanation:

To find the number of moles in a substance given it's number of entities we use the formula 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 = 1.38 × 10²⁴ atoms So we have We have the final answer

2.3 moles

Answer 2

The answer is 2.3 moles

Step-by-step explanation:

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

`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 = 1.38 × 10²⁴ atoms

So we have

`n = \frac{1.38 * {10}^(24) }{6.02 * {10}^(23) } \\ = 2.29235880...`

We have the final answer as

2.3 moles

Hope this helps you