Question

Nitric acid has the formula HNO3. If there are 3.55 × 10^23 atoms of N in the sample, how many moles of nitric acid are there?

a. 0.25 moles
b. 0.50 moles
c. 0.75 moles
d. 1.0 mole

Answer 1

Approximately 0.589 moles of nitric acid are present in the sample.

Step-by-step explanation:

To find the number of moles of nitric acid (HNO3) in the sample, we need to convert the number of nitrogen atoms to moles. The molar mass of nitrogen (N) is 14.01 g/mol. Therefore, 1 mole of nitrogen is equal to 14.01 g. We can use this information to convert the number of nitrogen atoms to moles:

Number of moles = number of atoms / Avogadro's number

= (3.55 × 10^23) / (6.022 × 10^23)

= 0.589 moles

Therefore, there are approximately 0.589 moles of nitric acid in the sample.