cynthiavarga0

cynthiavarga0

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University of Southern Philippines Foundation

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English4Chemistry2
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1. Calculate the final pressure, in atmospheres, for each of the following, if volume and amount of gas do not change.

A. A gas with an initial pressure of 1.20 atm at 73 ∘C is cooled to − 32 ∘C.xpress the pressure to three significant figures and include the appropriate units.

B.A sample of N2 with an initial pressure of 790. mmHg at − 71 ∘C is heated to 33 ∘C.Express the pressure to three significant figures and include the appropriate units.

2.An airplane is pressurized with air to 700 mmHg .

A.If air is 21% oxygen, what is the partial pressure of oxygen on the plane?Express your answer using two significant figures.

b.If the partial pressure of oxygen drops below 110 mmHg , passengers become drowsy. If this happens, oxygen masks are released. What is the total cabin pressure at which oxygen masks are dropped? Express your answer using two significant figures.

3.A sample of argon gas has a volume of 775 mL at a pressure of 1.24 atm and a temperature of 130 ∘C.

A.What is the volume of the gas in milliliters when the pressure and temperature of the gas sample are changed to 664 mmHg and 281 K , if the amount of gas remains the same?

B.What is the volume of the gas in milliliters when the pressure and temperature of the gas sample are changed to 0.600 atm and 78 ∘C, if the amount of gas remains the same?

C.What is the volume of the gas in milliliters when the pressure and temperature of the gas sample are changed to 16.8 atm and -13 ∘C, if the amount of gas remains the same?

4.A sample containing 5.00 g of O2 gas has an initial volume of 17.5 L . What is the final volume, in liters, when each of the following changes occurs in the quantity of the gas at constant pressure and temperature?

A.A sample of 1.50 g of O2 is removed from the 5.00 g of O2 in the container. Express the volume in liters to three significant figures.

B.A sample of 1.50 g of O2 is removed from the 5.00 g of O2 in the container.Express the volume in liters to three significant figures.

C.A sample of 2.00 g of O2 is added to the 5.00 g of O2 gas in the container.Express the volume in liters to three significant figures.

5.A gas mixture containing oxygen, nitrogen, and neon exerts a total pressure of 1.08 atm .

A.If helium added to the mixture increases the pressure to 1.78 atm , what is the partial pressure (atm) of the helium?

Answer: A. To calculate the final pressure, we can use the combined gas law: P...
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