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In the gaseous state, chlorine exists as a diatomic molecule Cl2 (Molar mass = 70.9 g/mol).Calculate the number of moles of chlorine present in 140 g of chlorine gas.

Respuesta :

cocoh13
1 mole = 70.9
X mole = 140
X=1.9746 moles
X= 1.98 when rounded to 3 significant figures.

Answer : The moles of chlorine present in 140 grams of chlorine gas are 3.96 moles.

Explanation : Given,

Mass of [tex]Cl_2[/tex] = 140 g

Molar mass of [tex]Cl_2[/tex] = 70.9 g/mol

Formula used :

[tex]\text{Moles of }Cl_2=\frac{\text{Mass of }Cl_2}{\text{Molar mass of }Cl_2}[/tex]

Now put all the given values in this formula, we get:

[tex]\text{Moles of }Cl_2=\frac{140g}{70.9g/mol}[/tex]

[tex]\text{Moles of }Cl_2=1.98mol[/tex]

The number of moles of chlorine in [tex]Cl_2[/tex] = 2 × 1.98 = 3.96 mole

Therefore, the moles of chlorine present in 140 grams of chlorine gas are 3.96 moles.

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