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 PaPa) to about 60,000 kPakPa (60,000,000 PaPa). It is often convenient to know the pressure in torr. If an HPLC procedure is running at a pressure of 5.50×108 Pa, what is its running pressure in torr? Express the pressure numerically in torr.

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Insects do not have lungs as we do, nor do they breathe through their mouths. Instead, they have a system of tiny tubes, called tracheae, through which oxygen diffuses into their bodies. The tracheae begin at the surface of the insect's body and penetrate into the interior. Suppose that a tracheae is 1.34 mm long with a cross-sectional area of 2.46 x 10-9m2. The concentration of oxygen in the air outside the insect is 0.794 kg/m3, and the diffusion constant is 1.26 x 10-5 m2/s. If the mass per second of oxygen is diffusing through a trachea is 1.66 x 10-12 kg/s, then find the oxygen concentration at the interior end of the tube.

1.If the partial pressure of N2 is 3.10 x 105 Pa and the partial pressure of Ne is 4.75 x 105 Pa in a given mixture, what is the mole fraction of Ne (XNe)?   What type(s) of intermolecular forces must be overcome when liquid dipropyl ether (CH3CH2CH2-O-CH2CH2CH3) vaporizes? (You may select more than one. Incorrect answers will be penalised.)   Question 2 options: a dipole-dipole forces b dispersion forces c hydrogen bonds d covalent bonds

a cylinder was connected to an open ended U-tube (1 atm) containing some mercury, Hg (density=13.6gcm^-3), and the Hg was displaced 100mm towards the container. What is the pressure of the gas inside the container?

Give typed full explanation not a single word hand written otherwise leave it  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 3.17×108 Pa , what is its running pressure in torr? Express the pressure numerically in torr.