Question

High-pressure liquid chromatography (HPLC) is a method used in chemistry and biochemistry to purify chemical substances. The pressures used in this procedure range from around 500 kilopascals (500,000 Pa ) to about 60,000 kPa (60,000,000 Pa ). It is often convenient to know the pressure in torr. If an HPLC procedure is running at a pressure of 2.70×108 Pa , what is its running pressure in torr? Express the pressure numerically in torr.

Answer 1

Answer: $0.02\times 10^8torr$

Explanation:

Pressure of the gas is defined as the force exerted by the particles on the walls of the container. It is expressed in various terms like 'mmHg', 'atm', Pascals , torr etc

All these units of pressure are inter convertible.

We are given:

Pressure of the gas = $2.70\times 10^8Pa$

Converting this unit of pressure into torr by using conversion factor:

$1Pa=0.0075torr$

$2.70\times 10^8Pa=\frac{0.0075}{1}\times 2.70\times 10^8Pa=0.02\times 10^8torr$

Thus the pressure in torr is $0.02\times 10^8$

Answer 2

We have to convert running pressure in an HPLC procedure from Pascal unit to Torr.

The answer is: 2.025 X 10⁶ torr.

Both of Pascal and Torr are units of pressure. We know, 1 Pascal is equal to 0.0075 torr.

Hence, 2.70 X 10⁸ Pascal is equal to 0.0075 X 2.70 X 10⁸ torr= 0.02025 X 10⁸ torr=  2.025 X 10⁶ torr.