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?

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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No. an alpha particle is a pair of protons and a pair of neutrons, i.e. a helium