Below is \"Cylinder - Piston Apparatus\" that contains an ideal gas. The piston

Question

Below is "Cylinder - Piston Apparatus" that contains an ideal gas. The piston can move up and down inside the cylinder without friction. Inside the cylinder is an ideal gas. Assume the piston is a circle of radius 0.13 m. On top of the piston is weight of 275 g. a) If the piston isn't moving up or down, then find the pressure, in magnitude, exerted by the weight on the gas in units of Pa. Ans: 51 Pa b) What is the pressure of the gas in units of Pa. Ans: 51 Pa Find the number of moles of water molecules is a 2.00 L bottle of Pepsi that you can buy at Vons. Assume that Pepsi is mostly water. Ans: 111 mol

Explanation / Answer

4) pressure = Force /area

= mg / pi*r^2

= 0.275*9.8 / pi*0.13^2

= 50.76 Pa

5) 2 L of water = 2kg

Molecular weight of water = 18 gm

no. of moles = 2000 / 18 = 111.11 moles

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