Question

$20\, mL$ of methane is completely burnt using $50\, mL$ of oxygen. The volume of the gas left after cooling to room temperature is

• A. 80 mL
• B. 40 mL
• C. 60 mL
• D. 30 mL

Answer 1

Answer: (D)

30 mL

Answer 2

$\therefore$ Volume of gas left after cooling

$=10\, mL O _{2}+20\, mL CO _{2}=30 \,,mL$
$H _{2} O (g)$ will be condense to $H _{2} O (l)$ after cooling.