Explore BrainMass

Explore BrainMass

    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.

    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?

    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?

    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?

    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

    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?