Question

Find the number of moles and molecules present in 7.1 gram of chlorine

Answer 1

Here is your answer:

Given:

Mass of chlorine gas = 7.1g

To find:

Number of moles in 7.1g of chlorine gas = ?

Formula to be used:

Molar mass = No. of element × Atomic weight of the element

Number of moles =

Calculation:

The calculate the molar mass of chlorine, the following formula must be used:

Molar mass = No. of element × Atomic weight of the element

Molar mass = 2 × 35.453

Molar mass = 70.90g/mol

To calculate the number of moles,

Number of moles = 0.100

Conclusion:

0.1 moles are present in 7.1g of chlorine gas.

Learn more about such concept

Obtain the moles of substances in the following:2.57 g As

Please mark me as the brainliest.

Also don't forget to rate me and click that thanks button.

Thanks and regards.

Answer 2

Given:

7.1 grams of chlorine gas.

To find:

We have to find the moles and number of molecules.

Solution:

The chemical formula of chlorine gas is $Cl_2$.

The molecular weight of chlorine gas is 70.90 grams.

Now we can write-

70.90 grams of chlorine gas occupy 1 mole.

Thus 7.1 grams of chlorine gas occupy 7.1/70.90=0.1 moles.

Again 1 mole of chlorine gas has $6.023×10^{23}$ number of molecules.

Hence 0.1 moles of chlorine gas has $6.023×10^{23}×0.1=6.023×10^{22}$ number of molecules.

Thus 7.1 grams of chlorine gas occupy 0.1 moles and $6.023×10^{22}$ number of molecules.