Educ. 2005, 82, 251). Balloons Tongs Flashlight Discussion: Charles’ Law describes the relationship between temperature and volume for gases. The volume of a gas is directly proportional to its temperature. Safety: Wear insulating gloves when handling materials in liquid nitrogen.
Once the wavelength is calculated, the heat capacity ratio for each of the gases will be calculated. Introduction When temperature is increased in a system, the internal energy is raised. It is assumed that the system has a constant volume, so the increase depends on different conditions based on which the heating takes place. If internal energy is plotted against temperature, a curve can be seen in a graph. The graph shows a variation as the system heats at a constant volume.
Gas Laws: Relationship between Pressure (P), Volume (V), Temperature (T) and quantity; Moles (n) Boyle’s Law (PV = constant) This is an inverse relationship: As volume decreases, pressure increases. Charles’ Law: (V/T = constant) This is a direct relationship. As Temperature decreases, Volume decreases. Avogadro’s Law: (V/n = constant) This is a direct relationship. As the number of moles decreases, the volume decreases Summary: Combined Gas Law: PV/nT = constant (T in Kelvins) P1V1/n1T1 = P2V2/n2T2 Ideal gas Law: PV = nRT R = .0821L atm/mol K Gay-Lussac’s/Avogadro’s Law of Combining Volumes Equal volumes of any gases at the same temperature and pressure contain the same number of moles of gas.
Standard Molar Volume The ultimate goal of this lab was to find the standard molar volume of hydrogen gas (H2). An unknown sample of metal to 3M H2SO4 and an eudiometer filled with water. The dense acid sank towards the bottom to react with the metal sample and form Hydrogen gas. The gas raising to the top of the container caused the pressure in the eudiometer to increase, which lead the water to be displaced. | Trail 1 | Trial 2 | Code | Skinny | Skinny | Mass of Metal | .041g | .027g | Temperature of Water | 296k | 296k | Vapor of Water Temperature | 21.1 mmHg | 21.2mmHg | Barometric Pressure | 76.632cm | 76.632cm | Volume of H2 collected | 29.15mL | 29.2mL | Height of Supported H2 column | 23.95cm | 23.15cm | After the O2 gas had fully reacted, measurements of mass, temperature, vapor, and H2 collected (as shown in the table above) .
The study of specific heat falls under the category of Thermochemistry which is further divided into the category of Calorimetry. An instrument called a calorimeter is used to measure specific heat. A piece of metal is placed in a container of water. This is then boiled. The piece of metal is then taken out of the boiling water and placed in a calorimeter which contains room temperature water.
In order to figure out what the mass was, the weight of the cylinder (42.16g) subtracted by the weight of the cylinder by itself (37.85g). Lastly, the Density of the water needed to be calculated. In order to determine density, use D=M/V and the density was written down. Next, the density of the mineral oil was taken. In order to figure out the density of the mineral oil 3 mL of water was poured into the second 10 mL graduated cylinder along with 3 mL of mineral oil and was weighed.
How many moles of hydrogen gas can be produced when 10.0 g of Zn react with excess HCl? (Hint: you must write a balanced chemical reaction first.) 2. If the pressure is 1.2 atm and the temperature is 20.0ºC, what volume of hydrogen is produced in prelab question #1? 3.
(4.) What is the total pressure(mmHg) of a gas mixture containing argon gas at 0.25 atm, helium gas at 350 mmHg and nitrogen gas at 360 torr. (Hint: use Dalton’s Law of Partial Pressures). *Dalton’s Law: a gas law stating that the total pressure exerted by a mixture of gases in a container is the sum of the partial pressures that each gas would exert alone. *Partial Pressure: the pressure exerted by a single gas in a gas mixture.
9. Calculate the grams of C6H6 need to produce 2.50 mols of CO2. 10. Calculate the number of grams of H2SO4 produced when .270 mols of water react with an excess of SO3. H2O + SO3 → H2SO4 1 HC/CC/TG KHS Stoichiometry Exercise 2 – moles to grams/ grams to moles Show your work.