Question

A 10 litres cylinder has He al. 8 atm / ${32}^{o}C$. How many balloons of 2L each at 2 atm and ${32}^{o}C$ can be filled with the gas available from the cylinder?

• A. 10.6
• B. 12
• C. 15
• D. 16

Answer 1

The correct option is C 15

$PV=nRT$

$P_1{V}_1=P_2{V}_2$

$P_1=8$ atm $P_2=2$ atm

$V_1=10lt$ $V_2=2n+10$

$8\times 10=2\times (2n+10)$

$2n+10=40$

$2n=30$

$n=15$