Question

A tire has a pressure of 780 mmHg at 27 C. If the tire is heated to 47 C on hot pavement, the new pressure will be
310 mmHg
280 mmHg
830 mmHg
590 mmHg
None of the above

Answer 1

use gay-lussac's law:
pressure times temperature is constant for a given volume.

Answer 2

If you take the ideal gas equation:

PV = nRT

assuming constant amount of gas and volume you have two equations based on whats given:

Eq. 1
\[\frac{P_1}{T_1} = \frac{nR}{V}\]

Eq. 2
\[\frac{P_2}{T_2} = \frac{nR}{V}\]

Since n, R and V are constant you get:

\[\frac{P_1}{T_1} = \frac{P_2}{T_2}\]

Or essentially the law that the person above stated

Answer 3

just be sure to convert your temperatures into Kelvin before using the gas law @Australopithecus has given