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# Gas Laws

### Your Next Breath Contains a Molecule from Caesar's Last Breath

Take a deep breath of air and assume it is one liter of air. What is the probability that the liter of air contains a molecule from Julius Caesar's last breath (also assume a liter of air)? Assume that the nitrogen that existed in the atmosphere ~ 2000 years ago is that which is currently present and that the liter of air has

### Determining the Mass of a Substance

1) What mass of oxgen gas will occupy 450.mL at 145mmHg and 62.5 degrees Celcius? 2) Find the volume in liters of 52.0g of CO2 at 410mmHg and 99.0 degrees Celcius.

### Physical chemistry: What is the partial pressure of the molecular hydrogen in the container?

A 400 L container at temperature of 4 celsius initially contains 0.25 mol He gas. Molecular hydrogen, which is a gas at 4 celsius is added until total pressure is 9.38*10^-2 atm. What is the partial pressure of the molecular hydrogen in the container?

### Problem with Ideal Gas Law

The reaction in an automobile airbag is: 2NaN3(s) 2Na(s) + 3N2(g) If 80.0g of NaN3 reacts, what volume of N2(g) is produced at 25oC and a pressure of 1.00 atm?

### About 3.2 kg of H2 is required for a vehicle to have a 500 km range...What tank pressure atm might one expect at 25 degrees celsius?..

109. Consider a vehicle powered by hydrogen gas. a. About 3.2 kg of H2 is required for a vehicle to have a 500 km range. Assume ideal gas behavior and a storage tank of 60 L (a comparable size to conventional gasoline vehicles). What tank pressure atm might one expect at 25 degrees celsius? b. Since their discovery in 1991, ti

### What is the pressure in atm?

What is the pressure in atm of 1.00g of NH3(g) in a 500mL container at 20oC?

### What mass of formaldehyde gas must be released?

What mass of formaldehyde gas (in grams) must be released from building materials, carpets, etc. in order to produce a concentration of 0.50 ppm of the gas in a room having dimensions of 4.0m X 5.0m X 1.0m? Hint: Calculate volume of room in cubic meters and convert to liters. Use ideal gas law and concentration to calculate a

### Volume of Air Necessary for Conversion of CO2 to H20

Assume that a pile of waste contains 340.0 mg/L of biodegradable CH2O and is processed through a 200000.0 L/day sewage treatment plant which converts 40% of the waste to CO2 and H2O. Calculate the volume of air (at 25 degrees, 1 atm) required for this conversion. Assume that the O2 is transferred to the water with 20% efficiency

### Osmotic Pressure

How would you prepare 1.0 L of an aqueous solution of sodium chloride having an osmotic pressure of 25 atm at 17°C?

### Gas problem dealing with volume, Pressure and Temperature

2C H10 + 21O2 --> 16 CO2 + 10H2O if 950 grams of O2 are used in the above reaction How many Liters od CO2 can be collected @ a Pressure of 700mmhg + Temperature of 47degrees C ?

### National Drinking Standard for Lead in Water

1. The National Drinking Water standard for lead in water is no more than 0.015ppm. If a particular water supply sample has 5.0x10^-7 moles of Pb per 5.0 liters, is it suitable for drinking? 2. If a gas occupies 625mL at 0oC and 760 torr pressure, what will its volume be at 223oC and 1520 torr pressure? 3. A metal tank of

### Reaction Between Hydrogen Selenide and Tin

See attachment. The composition of hydrogen selenide (H2Se) can be determined by heating tin (Sn) in a measured volume of the gas. The hydrogen selenide is decomposed, producing solid tin selenide (SnSe) and hydrogen gas. If the temperature and pressure are unchanged, the gas volume when the decomposition is over is the same

### Helium-filled Balloon Pressure

Keith wants a large helium balloon, his mom can only fit 10.0 L in her small car. The temperature outside is 17.0 The balloon has a mass of 500 g He. What pressure should she have the balloon filled with helium? a) 0.114 kPa b) 2.98 104 kPa c) 1.95 kPa d) 1.14 kPa How to set up the problem - explain in detail (high scho

### Pressure of Gas Temperature Equations

A sample of gas occupies 135 mL at 22.5 C; the pressure is 165 mm Hg. What is the pressure of the gas sample when it is placed in a 252-mL flask at a temperature of 0.0 C? pressure of gas sample___________________ mmHg Ethane, C2H6, burns in air according to the equation 2C2H6(g) 7 O2(g)---->4CO2(g) + 6H2O(g) Wh

### Pressure volume question

I need need help with the following. A flexible gas storage container has a volume of 3.5 x 10^2 L at a temperture of 27 degrees celcius and a pressure of 115 kPa. What is the new volume if the temperture drops to -10 degrees celcius and the pressure drops to 99 kPa?

### Equilibrium Concentrations

At 2400K, Kc=2.5 x 10 -3rd power. Equilibrium is obtained at 2400K starting with a reaction mixture of 0.20 mil of N2 and 0.20 mil of O2 in a 5.00 L vessel. What equations or processes would I used to find the concentrations in moles per liter for N2, O2, and NO?

### Ideal Gas Laws

I am given the volume (1024ml), pressure (1.2 atm) and temperature (36o C) and I need to determine the number of moles present.

### Vapor pressure and temperature

The vapor pressure of water at 22 degrees C is 19.800 torr. If you put 26.662 g of water in a cubic container that is 1.1000 m on an edge, will there be any liquid water remaining in the container at 22 degrees C or will it all be vapor? R = 0.0820578 L*atm/K*mol.

### Ideal Gas Law - Temperature of Boiling Point of Chlorine

A hydrogen gas thermometer is found to have a volume of 100.0 cm3 when placed in an ice-water bath at 0°C. When the same thermometer is immersed in boiling liquid chlorine, the volume of hydrogen at the same pressure is found to be 87.2 cm3. What is the temperature of the boiling point of chlorine?

### Calculating the Volume of Gas on Venus

The surface temperature of Venus is about 1050K and the pressure is about 75 Earth atmospheres. Assuming that these conditions represent a Venerian "STP", what is the standard molar volume (in liters) of a gas on Venus?

### Gas equations

Ozone molecules in the stratosphere absorb much of the harmful radiation from the sun. the temp. and the pressure of ozone in the stratosphere are 250 K and 1.0*10^-3 atm. How many ozone molecules are present in 1.0 L of air under these conditions?

### Ideal Gas Equations

At STP, 0.280L of a gas weighs 0.400g. Calculate the molar mass of the gas.

### Change in gas pressure when volume is decrased

A volume of gas is decreased by half while the temperature remains constant. How much does the gas pressure change? (2) State the relationship between the volume and pressure of a gas when the temperature is held constant (Boyles law). (3) Does data taken in an experiment support the idea that the pressure times the volume

### Understanding how a real gas (eg. van der Waals gas) differs from an ideal gas. Interpreting the pressure-volume behaviour of gases.

In an industrial process, nitrogen has to be heated to 500K at constant volume. If it enters the system at 300 K and 100 atm, what pressure does it exert at its final working temperature? Treat it as a van der Waals gas. Assume the volume is 1 m^3 (where "^" means "to the exponent").

### Understanding the properties of gases. Understanding partial pressure of a gas in a mixture, and how partial pressure relates to the mole fraction.

One mole of nitrogen and three moles of hydrogen are injected into a container of volume 10 dm^3 at 298 K. What are the partial pressures and the total pressure? (Note: "^" means "to the exponent".)

### Understanding the ideal gas law. Using the ideal gas law to calculate work done as a result of a chemical reaction that generates a gas.

Calculate the work done when 50 g of iron dissolves in hydrochloric acid in (a) a closed vessel and (b) an open beaker. Hint: Use the ideal gas law and equations to determine amount of work done when a gas expands.

### Calculating the density of a gas at STP.

What is the density of N2O at STP?

### Application of Charles's Law (one of the derived basic gas laws) to calculate volume at a different temperature.

A certain mass of calcium carbide, CaC2, reacts completely with water to produce 64.5 L of acetylene, C2H2, at 50 degrees C and 1 atm. If the same reactants react completely at 300 degrees C and 1 atm, what will be the volume of acetylene?

### Dalton's law - Pressure in a container

What is the pressure in a 10 L container that is at 27o C and which contains 3 mol of H2 gas and 8 mol of He gas?

### Will Pressure Exceed Capacity?

Question: A metal tank of volume 75.5 L will burst if the pressure in it exceeds 50.0 atm. Will this pressure be exceeded by 82.0 moles of a gas in it at 25 degrees Celsius?