Things to Know Flashcards
Unless stated otherwise, what density do you use for water?
1.00 g/mL
Unless stated otherwise, what heat capacity do you use for water?
4.184 J/K or 4.184 J/g°c
In this problem:
“Say you have a 100g sample of water at 20°C. You heat it up to 50°C. How much heat did you add to the water?”
What formula/equation would you use to solve this, and what would be the answer?
q = mcΔT, 10,460 J
In this problem:
“Imagine you have a 50g sample of aluminum that you heat from 25°C to 75°C. The specific heat capacity of aluminum is 0.903 J/g°C. How much heat did you add to the aluminum?”
What formula/equation would you use to solve this?
q = cΔT, 20 J
In this problem:
“Imagine you have a balloon filled with 1.5L of air at a pressure of 1 atm. You then compress the balloon, decreasing its volume to 0.75L. What is the new pressure inside the balloon?”
What formula/equation would you use to solve this, and what would be the answer?
Boyle’s Law, 2 atm
In this problem:
“Imagine you have a balloon filled with 2L of air at a temperature of 20°C. You then heat the balloon, increasing its temperature to 50°C. Assuming the pressure remains constant, what is the new volume of the balloon?”
What formula/equation would you use to solve this?
Charles Law, 2.21L
In this problem:
“Imagine you have two containers, each filled with a different gas. Container A contains 1 mole of nitrogen gas (N2) at a volume of 22.4L. Container B contains 2 moles of oxygen gas(O2) at the same temperature and pressure as container A. What is the volume of Container B?”
What formula/equation would you use to solve this, and what would be the answer?
Avogadro’s Law, 44.8L
In this problem:
“Imagine you have two identical container, one filled with helium(He) and the other with neon(Ne). Both gases are at the same temperature and pressure. Which gas will effuse faster through a tiny hole in the container?”
What formula/equation would you use to solve this, and what would be the answer?
Rate of Effusion, helium molecules will effuse faster
In this problem:
“Say nitrogen gas(N2) effuses through a small opening at a rate of 10mL/s. If you have a gas that effuses twice as fast as nitrogen, what is the molar mass of this unknown gas?”
What formula/equation would you use to solve this, and what would be the answer?
Graham’s Law, 7 g/mol
In this problem:
“A container holds a mixture of 3.0g of nitrogen gas (N2) and 2.0g of oxygen gas (O2) at a constant temperature. The total pressure in the container is 1.5atm. What is the partial pressure of nitrogen gas?”
What formula/equation would you use to solve this, and what would be the answer?
Partial Pressures Fromula and Dalton’s Law of Partial Pressures, 0.947 atm
In this problem:
“A sample of helium gas(He) occupies a volume of 2.5L at a pressure of 1.2 atm and a temperature of 25°C. How many moles of helium are present?”
What formula/equation would you use to solve this, and what would be the answer?
Ideal Gas Law, 0.123 moles of helium are present
In this problem:
“A container holds a mixture of water vapor and nitrogen gas at a temperature of 25°C. The partial pressure of the nitrogen gas is 0.8atm. If the vapor pressure of water at 25°C is 0.0313 atm, what is the total vapor pressure in the container?”
What formula/equation would you use to solve this, and what would be the answer?
Total Vapor Pressure and Dalton’s Law of Partial Pressures, 0.8313 atm
In this problem:
“What is the volume of 1 mole of any ideal gas at STP?”
What formula/equation would you use to solve this, and what would be the answer?
STP, 22.4L
In this problem:
“A barometer reads 760 torr. What is the pressure in atm?”
What formula/equation would you use to solve this, and what would be the answer?
torr to atm conversion, 1 atm
In this problem:
“The pressure inside a container is 0.5 atm. What is the pressure in mmHg?”
What formula/equation would you use to solve this, and what would be the answer?
atm to mmHg conversion, 380 mmHg
In this problem:
“A gas sample has a pressure of 500 torr. What is the pressure in mmHg?”
What formula/equation would you use to solve this, and what would be the answer?
torr to mmHg conversion, 500 mmHg
In this problem:
“The pressure of a gas is 600 mmHg. What is the pressure in atm?”
What formula/equation would you use to solve this, and what would be the answer? (rounded to 3 decimals)
mmHg to atm conversion, 0.789 atm
