Dumas Method lab report (1)

3. A mixture of Na2CO3 and NaHCO3 has a mass of 22.0 g. Treatment with excess HCI solution liberates 6.00 L CO2 at 25°C and 0.947 atm pressure. Determine the percent Na2CO3 in the mixture. Hint: Remember, percent mass is the ratio of the mass of substance and the total mass. 55% O 35% 40% 65%

1. Carbon dioxide gas has an initial pressure of 650 mmHg and an initial volume of 0.50 L. At constant temperature and in a closed-system, what is the pressure (in atm) when the volume of the sample is decreased to 125 mL? 2. Under constant pressure, a sample of hydrogen gas initially at 88.0 °C and 9.40 L is cooled until its final volume is 2.50 L. What is its final temperature in the unit of Kelvin? 3. Given that 35.5 g of carbon monoxide are present in a container if volume 250 mL. What is the pressure of the gas (in atm) if the temperature is 55 °C. 4. What volume is occupied by 15.5 g of argon gas at a pressure of 820 mmHg and a temperature of 50.0 °C? Would the volume be different if the sample were 15.5 g of chlorine gas (under identical conditions)?

1. Write down the chemical formula for butane and calculate its molar mass. 2. Derive the expression for the molar mass in terms of the mass, pressure, volume, and temperature of a gas (hint: use the ideal gas law and the definition of molar mass in Equation (2)). 3. Using Dalton’s law of partial pressures, calculate the total pressure of a mixture of three gases, N2, He, and Ne, at partial pressures of 0.32 atm for N2, 0.15 atm for He, and 0.42 atm for Ne that is in a 2.5 L flask at 15 ˚C. 4. The barometric pressure is generally given in units of inHg. Convert inHg to atm. Recall that 2.54cm = 1inch. Use dimensional analysis.

1. What is the mass of a water molecule in grams? 2. A chemist analyzed a sample of a compound that was known to contain potassium, manganese, and oxygen. She obtained the following results: The total mass of the sample = 316.08 g Mass of potassium = 78.20 g Mass of manganese = 109.88 g Determine the percentage composition of the compound 3. If at S.T.P 4.48 L of NH3(g) is allowed to react with 9.03 x 1022 molecules of O₂(g), please answer the questions for the following reaction: 4NH3(g) + 5O₂(g) 6H₂O(g) + 4NO(g) a. What is the limiting reactant? Please show all your work. b. What mass of nitrogen monoxide can be expected? c. If 3.00 g of nitrogen monoxide recovered, what would the percentage yield be? d. What reactant is in excess? Following the reaction, what is the remaining mass of the excess reactant?

Room temperature:   294.0 K Barometric pressure:   770.5 mmHg Vapor of water:   18.6 mmHg Volume of O2 collected:   57.90 mL Density of H2O2:   1.01 g/mL % Composition H2O2:   3.02 % Volume of H2O2 used:   5.00 mL Letter of the unknown solution of H2O2:   B Volume of O2 collected for the unknown:   20.20 mL   corrected barometric pressure. 752 mmHg   Expert, what is a term letter?

Room temperature:   295.9 K Barometric pressure:   769.0 mmHg Vapor of water:   21.1 mmHg Volume of O2 collected:   59.20 mL Density of H2O2:   1.01 g/mL % Composition H2O2:   3.02 % Volume of H2O2 used:   5.00 mL Letter of the unknown solution of H2O2:   C Volume of O2 collected for the unknown:   64.90 mL     Based on the reaction stoichiometry, calculate the number of moles of O2.

An open flask sitting in a lab refrigerator looks empty, but it is actually filled with a mixture of gases called air. If the flask volume is 1.00 L,1.00 L, and the air is at standard temperature and pressure, how many gaseous molecules does the flask contain?

When a meteorologist reports precipitation in the weather forecast, this is usually associated with a low-pressure system. Go through the following activity to explain why precipitation would be associated with a low atmospheric pressure. Air that is saturated or contains water vapor will have more water and [ Select ] v dry air in the overall mixture compared to dry air. This causes the overall density of the air to [ Select ] V. The air will be [ Select ] dense than dry air and the atmospheric pressure will be [Select] than dry air.

Zn reacts with hydrochloric acid to give zinc chloride and hydrogen gas. A sample of 5 g of a Zn mineral requires 10 mL of commercial HCl of 37% purity, by weight and density 1.19 g/mL, to react completely. Find: a) The mass of zinc contained in the sample. b) The purity of the zinc mineral. c) The pressure exerted by the hydrogen gas collected in a 2 L container and at a temperature of 20ºC.please use conversion factors and mark the solutionsThe solutions should be : 3,92 g; 78,4%; 0,72 atm.I just dont know how to do it

Zn reacts with hydrochloric acid to give zinc chloride and hydrogen gas. A sample of 5 g of a Zn mineral requires 10 mL of commercial HCl of 37% purity, by weight and density 1.19 g/mL, to react completely. Find: a) The mass of zinc contained in the sample. b) The purity of the zinc mineral. c) The pressure exerted by the hydrogen gas collected in a 2 L container and at a temperature of 20ºC.please use conversion factors and mark the solutions

Use Boyle's law, P1V1 = P2V2, to calculate the volume, in mL, of the dry H2 at room pressure.  Please enter your volumes using three decimal places and do not use scientific notation.   partial pressure of the dry H2 in Torr = 734.7 torr moles of magnesium and moles of hydrogen gas produced in each trial -  trial 1 - 0.003188 trial 2 - 0.003225 trial 3 - 0.003163

(Record your answer with rounded answer to proper significant digits and the proper units.) 1.How many moles of butane (C4H10(g)) were combusted in the presence of excess oxygen gas if 55.8 L of water vapour at STP is collected?Hint: Write a balanced chemical reaction equation first. 2.One of the steps to sweeten sour gas using the Claus process is reacting hydrogen sulfide gas with sulfur dioxide gas to produce water vapour and sulfur. 16H2S(g)+8SO2(g)----->16H2O(g)+3S8(s)  8.75 kL of hydrogen sulfide at 175 kPa and 250 °C reacts with excess sulfur dioxide. Calculate the mass, in kg, of sulfur produced.

江苏高考分数线 A Acellus Applications of the Ideal Gas Law 0.0453 moles of hydrogen gas were produced by the reaction. Calculate the volume of the gas at standard temperature and pressure. Mg + 2HCI → MgCl2 + H₂ Volume H₂ = [?]L C Liters of H₂ Enter 28 2 Resources Help

Glycine is an amino acid made up of carbon, hydrogen, oxygen, and nitrogen atoms. Two samples of glycerine are combusted during an experiment to determine the empirical formula of glycerine. Sample 1: Combustion of a 0.2036 g sample produced 132.9 mL of CO2 at 25°C and 1.00 atm. and 0.122 g of water. Sample 2: 0.2500 g of glycine is treated in such a way that all the nitrogen atoms are converted to N2 gas. The volume of the nitrogen gas collected was 40.8 mL at 25°C and 1.00 atm. Determine: 1.        The percentages of carbon and hydrogen in glycine. 2.       The percentage of nitrogen in glycine. 3.       The percentage of oxygen in glycine. 4.       The empirical formula of glycine.

QUESTION#1: Advanced Material TOPIC NAME: Calculating partial pressure in a gas mixture   A 9.00L tank at 26.1°C is filled with 16.4g of chlorine pentafluoride gas and 7.48g of sulfur tetrafluoride gas. You can assume both gases behave as ideal gases under these conditions. Calculate the mole fraction and partial pressure of each gas, and the total pressure in the tank. Round each of your answers to 3 significant digits. chlorine pentafluoride mole fraction: ?   partial pressure: ? atm sulfur tetrafluoride mole fraction: ?   partial pressure: ? atm Total pressure in tank: ? atm         QUESTION#2: Advanced Material TOPIC NAME: Using reactant reaction order to predict changes in the initial rate   A certain reaction is first order in (N2) and second-order in (H2). Use this information to complete the table below. Round each of your answers to 3 significant digits. N2 H2 initial rate of reaction…

The world burns approximately 3.7 * 1012 kg of fossil fuel per year. Use the combustion of octane as the representative reaction and determine the mass of carbon dioxide (the most significant greenhouse gas) formed per year. The current concentration of carbon dioxide in the atmosphere is approximately 399 ppm (by volume). By what percentage does the concentration increase each year due to fossil fuel combustion? Approximate the average properties of the entire atmosphere by assuming that the atmosphere extends from sea level to 15 km and that it has an average pressure of 381 torr and average temperature of 275 K. Assume Earth is a perfect sphere with a radius of 6371 km.

So here are a series of experiments:1. A balloon was held against a wall. When it was released, the balloon fell to the floor. 2. A balloon was rubbed with a piece of wool and again held against a wall. This time, whenthe balloon was released it stuck to the wall. 3.  A  hole was poked in the bottom of a plastic cup. The cup was filled with water, and thewater was allowed to drain out through the hole in the bottom of the cup. While the water wasrunning out the bottom of the cup, a balloon was held near the stream of water. The watercontinued to fall straight down. 4. The previous demonstration was repeated, except this time the balloon was rubbed withwool before it was held near the stream of water. This time, the stream of water was drawntoward the balloon instead of falling straight down. Please explain all of the above. Also please show that you have a really good understanding ofthe laws of electrostatics and the structure of atoms as you do so, and use each of the following terms…

both chemical and flame tests are used to positively identify carbon dioxide gas. true false

Constants Periodic Table A sample of a liquid substance called jojane- named after the narcissitic scientist Dr. Joey Negdirf who discovered the substance- was brought back to Earth following a five year mission exploring the Andromeda galaxy. In their lab on earth, Dr. Negdirf's team conducted a number of experiments to determine the physical properties of the substance. Part A Using the Dumas method to determine the molar mass of a volatile liquid, a sample of jojane was vaporized in a 2.000 L vessel and heated to 401.6 K at 1.150 bar. The mass of the vapour in the vessel was 5.106 g. Determine the the molar mass of the compound. 60.10 g mol-1 O 88.14 g mol-1 O 72.09 g mol-1 O 74.12 g mol-1

naining Time: 43 minutes, 12 seconds. estion Completion Status: QUESTION 20 In the experiment "Molar mass of volatile liquid", the pressure of the gas inside a flask was the same as atmosphere, and the temperature was identical to the boiling water temperature of water bath. How did you measure the volume of the gas inside the flask? - O Read the volume written on the flask. Fill the flask up to the brim with water and then transfer the water to a graduated cylinder. Measure the volume of the liquid added to the flask before heating the sample. Measure the volume of the liquid that condenses in the flask after cooling the sample. QUESTION 21 Name the laboratory equipment. Save All Click Save and Submit to.save and submit. Click Save All Answrers to save all anstcers

Part 1. A glass bottle, which is half-filled with water, has a balloon attached to its opening. The bottle is placed in a hot water bath for some time. Explain the change to the size of the balloon based on the kinetic molecular theory.Part 2. What would most likely happen to the balloon if the bottle was then placed into a jar of cold water with ice cubes? Explain your answer based on the kinetic molecular theory.In both cases, assume the balloon is attached tightly enough so that air does not escape the system.

1. Suppose atmospheric pressure is 26.68 inches.  Convert this to atm.  When the ideal gas law constant 0.0821 atm L/ K mol is used, the pressure must be in atm. 2. Consider a compound where it is determined that 5.432 g is equivalent to 0.041 moles.  What is the molar mass?

1. Determine the Empirical Formulas from the % Composition data. Compound A: Compound A has a % composition (by mass) of 59.96% C, 26.62% O, and 13.42% H Compound A effuses 1.478 times faster than Xenon gas Compound B: Compound B has a % composition (by mass) of 62.04% C, 27.55% O, and 10.41% H Compound B effuses 1.063 times faster than Xenon gas

Based on the kinetic molecular model, solids usually have higher densities compare two liquids. However, ice , a solid form of H2O floats on liquid water which means ice is less dense than water. What do you think is the reason for this phenomenon? What is the biological significance of this concept?