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11 Dec 2019

the reaction of solid phosphorus (P4) with a chlorine gas produces solid phosphorus pentachloride. If 16.0 grams of phosphorus is reacted with 106.0 grams of chlorine gas in a closed container that has a volume of 2.00 L and a temperature of 53.0 degrees celsius, what is the initial pressure (before the reaction starts) and the final pressure (after the reaction is completed)

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13 Dec 2019

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A cylinder is filled with pure oxygen. The initial pressure is 1 Atm and the temperature is O^oC. Initially, the volume of the gas is 0.500 liter.

The cylinder contains a small piece of solid red phosphorus. It is ignited and burns completely to form a white solid powder (P₂O₅). The difference in volume between the two solids can be neglected.

After cooling down to initial pressure and temperature, the volume of the gas is found to be reduced to 0.41 liter.
What was the mass of the phosphorus in milligrams?

Hint: First write a balanced reaction equation involving P, oxygen and the oxide.
Then use the "n" in the gas law to find what the volume change ÎV corresponds to.
Atomic mass for P: 31 g/mol
(Answer within 1% of correct value)

Part A:

A certain amount of chlorine gas was placed inside a cylinder with a movable piston at one end. The initial volume was 3.00 L and the initial pressure of chlorine was 1.80 atm . The piston was pushed down to change the volume to 1.00 L. Calculate the final pressure of the gas if the temperature and number of moles of chlorine remain constant..

Express your answer numerically in atmospheres.

Part B:

In an air-conditioned room at 19.0 âC, a spherical balloon had the diameter of 50.0 cm. When taken outside on a hot summer day, the balloon expanded to 51.0 cm in diameter. What was the temperature outside? Assume that the balloon is a perfect sphere and that the pressure and number of moles of air molecules remains the same.

Express your answer numerically in degrees Celsius.

Part C:

A cylinder with a movable piston contains 2.00 g of helium, He, at room temperature. More helium was added to the cylinder and the volume was adjusted so that the gas pressure remained the same. How many grams of helium were added to the cylinder if the volume was changed from 2.00 L to 3.70 L ? (The temperature was held constant.)

Express your answer numerically in grams.

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