Here's how to determine the pressure and temperature changes when a gas is changed from 380 torr and 546 K to STP (Standard Temperature and Pressure):

Understanding STP

* Standard Pressure: 1 atmosphere (atm) = 760 torr

* Standard Temperature: 273.15 K (0°C)

Calculations

1. Pressure Change:

* The initial pressure is 380 torr.

* The final pressure at STP is 760 torr.

* Change in pressure: 760 torr - 380 torr = 380 torr increase

2. Temperature Change:

* The initial temperature is 546 K.

* The final temperature at STP is 273.15 K.

* Change in temperature: 273.15 K - 546 K = -272.85 K decrease

Summary

To change the gas from 380 torr and 546 K to STP, you need to:

* Increase the pressure by 380 torr.

* Decrease the temperature by 272.85 K.