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28 July, 19:27

Bacteria and viruses are inactivated by temperatures above 139 ∘C in an autoclave. An autoclave contains steam at 1.00 atm and 100 ∘C. At what pressure, in atmospheres, will the temperature of the steam in the autoclave reach 139 ∘C, if n and V do not change?

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  1. 28 July, 20:18
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    To answer this question, we will use pressure law which states that:

    "At constant volume of a fixed mass of gas, the pressure of the gas is directly proportional to the temperature"

    This means that:

    Pi / Ti = Pf / Tf where:

    Pi is the initial pressure = 1 atm

    Ti is the initial temperature = 100 + 273 = 373 degree kelvin

    Pf is the final pressure that we want to calculate

    Tf is the final temperature = 139 + 273 = 412 degree kelvin

    Substitute in the equation with the givens to calculate the pressure as follows:

    1 / 373 = Pf / 412

    Pf = (1/373) * 412 = 1.104557641 atm
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