12 Carbide
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can someone please help me with these gas stoichiometry questions PLEASE?
Hydrogen gas is collected over water from the reaction of HCL and Mg. What is the volume of hydrogen gas produced if 0.0096g of Mg reacts to completion. The P-hydrogen is 80.1 Kpa and the temperature is 22 degrees C.
A 3.25 g sample of solid calcium carbide, CaC2, reacted with water to produce acetylene gas, C2H2 and aqueous calcium hydroxide. If the acetylene gas was collected over water at 17 degrees C and Pt of 0.0974 atm, how many milliliters of acetylene were produced. Pwater vapor is 14.5 mmHg and or 1.94 KPa
a 10.0 sample of helium is vaporized and collected over water at 50.2 degrees C. The total pressure of the system is 80.5 KPa (Pwater-vapor =12.34 Kpa) what is the volume occupied by the sample of He? (confused on what pressure i am to use)
A 6.0 L sample of methane gas is collected with water displacement. The total pressure of the system is .787 atm adn the temperature is 290K. what will happen to the volume if the methane goes to STP?
much appreicated for any help
Life is tough, guy. Chemists (and Chem Engrs) were happy using atm and mm Hg for pressure, and along came the ass-wipe Physicist-types with their purist approach to pressure, and the Pascal (which is usually so small to be useful as is), to screw it all up.
The reason I bring this up is that when you collect any gas over water, you have to subtract off the vapor pressure of the water at the collection temp. Usually, this is in mm Hg. In problem #1, you figure the moles of H2 produced from the reaction. So you have n, T, P (80.1 KPa- VP of water), so you can solve for V.
In problem #2, you have the same deal except that your observed pressure (Pt) is in atm.
In problem #3, I assume you have 10 mg of He or
2.5 millimole (boy, am I a help). So you have the same deal again. You would use for P, the total pressure 80.5 Kpa - 12.34 Kpa, the vapor pressure.
In problem #4, You know V of methane. You have to adjust the total pressure for the vapor pressure of water at 290K (17C, see problem 2). You have T, so you can find n. At STP, the volume will be n x 22.4 Liters/mole.