Question

2 mole of ammonia occupied a volume of 5 litre at ${27}^{o}C$ then calculate the pressure of the gas if it obeys van der Waals equations given $a=4.17atmlitr{e}^{2}mo{l}^1,b=0.037litmo{l}^{-1}$

• A. 9.88 atm
• B. 7.24 atm
• C. 9.33 atm
• D. 7.38 atm

Answer 1

The correct option is A 9.88 atm

By Van der waals equation,

$(P+\frac{n^{2}q}{v^2})(v-nb)=nRT$

$⟹(P+\frac{4\times 4.17}{25})(25-2\times 0.037)=2\times 0.0821\times 300$

$\therefore P=9.88$ $atm$