Question

calculate the no of moles present in 7.1g of chlorine gas

Answer 1

no of moles = given mass /molar mass
here the given mass of chlorine gas=7.1g
and its molar mass is (Cl2)=71g
therefore no of moles=7.1/71=0.1 
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Answer 2

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 = $\frac{Given mass}{Molar mass}$

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 = $\frac{Given mass}{Molar mass}$

Number of moles = $\frac{7.1}{70.90}$

Number of moles = 0.100

Conclusion:

0.1 moles are present in 7.1g of chlorine gas.

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