determine the number of moles in 4.21 x 10^23 molecules of cacl2

The number of moles in 4.21 x 10²³ molecules of CaCl2 is 0.69moles.

HOW TO CALCULATE NUMBER OF MOLES:

The number of moles of a substance can be calculated by dividing the number of molecules in the substance by Avogadro's number as follows:no. of moles (mol) = no. of molecules ÷ 6.02 × 10²³ molecules. According to this question, 4.21 x 10²³ molecules of CaCl2 is given. The number of moles in this molecule can be calculated as follows: no. of moles = 4.21 x 10²³ ÷ 6.02 × 10²³no. of moles = 0.69 × 10²³-²³no. of moles = 0.69molesTherefore, the number of moles in 4.21 x 10²³ molecules of CaCl2 is 0.69moles.

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0.699 mole CaCl₂

Explanation:

To get the number of moles we use the Avogadro's number.

Avogadro's number is 6.022 x 10^23.

But, 1 mole of a compound contains  6.022 x 10^23 molecules

In this case;

we are given 4.21 × 10^23 molecules of CaCl₂

Therefore, to get the number of moles

Moles = Number of molecules ÷ Avogadro's constant

          = 4.21 × 10^23 molecules ÷  6.022 x 10^23 molecules/mole

          = 0.699 mole CaCl₂

Hence, the number of moles is 0.699 mole of CaCl₂

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