A steel cylinder has a pressure of 550 torr at 177 degrees Celsius. What will be the pressure if the temperature is decreased by 87 degrees Celsius?

Explanation:

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In this case, when we have a gas that is undergoing a change in both pressure and temperature, we utilize the Gay-Lussac's equation as shown below:

Thus, since we are given the initial pressure and temperature and the final temperature, we can compute the final pressure as shown below:

So we plug in, by making sure the temperatures are in kelvins, to obtain:

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