Question

Compressed oxygen is sold at a pressure of $100$ atmosphere in a cylinder of $49$ litre. The number of moles of oxygen in the cylinder is:

• A. $400$
• B. $100$
• C. $300$
• D. $200$

Answer 1

Answer: (D)

$200$

Applying $PV=nRT$

$n=\frac{100\times 49}{0.0821\times 298}$ (room temperature.)

$n=200$