Question

Assume that you take a flask, evacuate it to remove all the air and find it's mass to be 478.1 g .You then fill the flask with argon to a pressure of 2.15 atm and reweigh it. What would the balance read (in grams) of the flask has a volume of 7.35 L and the temperature is ${20}^{0}C$ ?

• A. 203.6 g
• B. 504.3 g
• C. 471.1 g
• D. None of these

Answer 1

The correct option is D None of these

Given that,

$P=2.15atm$

$V=7.35L$

$T=20.0$

$R=8.3145$ (gas constant )

$n=?$

$PV=nRT$

$2.15\times 7.35=n\times 8.31\times 20$

$n=0.0950$

therefore mass =$0.0950\times 39.95$

$3.80g$

But original mass =$478.1+3.80g$

$=481.90g$

Thus, option $D$ is correct.