4 years ago

Plz answer I don't get this!!!

Chemistry

1 answer:

Romashka [77]4 years ago

5 0

Didn't you review it in School?

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A cylinder with a movable piston contains 2.00 g of helium, He, at room temperature. More helium was added to the cylinder and t

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Avogadro's law : It is defined as the volume of gas is directly proportional to the number of moles of gas at constant pressure and temperature.

$V\propto n$

or,

$\frac{V_1}{n_1}=\frac{V_2}{n_2}$

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$V_2$ = final volume of gas = 3.50 L

$n_1$ = initial moles of gas = $\frac{\text{Mass of He}}{\text{Molar mass of He}}=\frac{2.00g}{4g/mol}=0.5mol$

$n_2$ = final temperature of gas = ?

Now put all the given values in the above equation, we get:

$\frac{2.00L}{0.5mol}=\frac{3.50L}{n_2}$

$n_2=0.875mol$

Now we have to calculate the mass of helium were added to the cylinder.

$\text{Mass of He}=\text{Moles of He}\times \text{Molar mass of He}$

$\text{Mass of He}=0.875mol\times 4g/mol=3.5g$

Mass of helium added = 3.5 - 2.00 = 1.5 g

Thus, the mass of helium added to the cylinder was, 1.5 grams

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