15. the ratio pv to nrt is plotted against pressure for ch4 at 0°c and 200°c. why does the curve for 0°c drop below the horizontal line for an ideal gas whereas the curve for 200°c does not?
a) at 200°c, the molecules can overcome intermolecular attractions.
b) at 200°c, the volume of individual molecules becomes negligible.
c) at 200°c, the forces between molecules become repulsive.

A) At 200 °C, the molecules can overcome intermolecular attractions.

Explanation:

At 200 °C, the molecules can overcome intermolecular attractions, so the exerted pressure by the movement of the molecules  increases and the positive deviation from ideal gas behavior occurs.

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.