Question

A sample of carbon tetrachloride (CCl4) contains 3 moles of the substance. How many atoms are there in the sample?

Answer 1

Answer:

no. of atoms = 3×avogadro no.

no. of atoms = 3×6.023×10^3

= 18.69× 10^23

Answer 2

Given:

• Number of moles = 3
• Substance = CCl₄

To find:

Number of atoms = ?

Solution:

When the number of moles of any substance is givenand if asked to find the number of atoms present in the sample, apply this formula:

Number of atoms = Number of moles × Avogadro Number

⇒ Number of atoms = 3 × 6.022 × 10²³

⇒ Number of atoms = 18.066 × 10²³

∴ Number of atoms present in the sample = 18.066 × 10²³

KNOW MORE:

• When number of moles is not given in the question, find it out by dividing the Given Mass with Molar mass because

Number of moles = Given Mass ÷ Molar mass

• Here the molar mass of CCl₄ is

12 + 4(35.5)

= 154 g/mol