Constants | Periodic TableA gas of unknown molecular mass was allowed to effuse through a small opening under constant-pressure conditions. It required 105 s for 1.0 L of the gas to effuse. Under identical experimental conditions it required 29 s for 1.0L of O2 gas to effuse.▾Part ACalculate the molar mass of the unknown gas. (Remember that the faster the rate of effusion, the shorter the time required for effusion of 1.0 L; that is, rate and time are inversely proportional.)Express your answer in grams per mol to two significant figures.M =Ο ΑΣΦSubmitRequest Answer3+< Return to AssignmentProvide Feedbacka%?g/molMacBook Pro曲C

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Answered: Constants | Periodic Table A gas of…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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a 2.802g sample of an unknown pure metal (M) is added to a 0.2 L solution of 2 mol/L H2SO4(aq). The metal reacts with the acid until the metal is completely gone to form M3+(aq) ion in the solution and produces hydrogen gas that is collected. The hydrogen gas that is collected over water that is isolated from the reaction has a volume of 0.82 L at 25 degrees Celsius and a total pressure of 704.0 mmHg. How many moles of H2(g) are produced? Write a balanced equation for the reaction of M with H2SO4(aq). What is the identity of metal M?
Sometimes in lab we collect the gas formed by a chemical reaction over water (see sketch at right). This makes it easy to isolate and measure the amount of gas produced. Suppose the CO₂ gas evolved by a certain chemical reaction taking place at 55.0 °C is collected over water, using an apparatus something like that in the sketch, and the final volume of gas in the collection tube is measured to be 129. mL. g x10 177 Sketch of a gas-collection apparatus x collected gas Calculate the mass of CO₂ that is in the collection tube. Round your answer to 2 significant digits. You can make any normal and reasonable assumption about the reaction conditions and the nature of the gases. water chemical reaction
The compound Mg(ClO3)2 decomposes when heated according to the equation below. Mg(ClO3)2 (s) ➝ MgCl2 (s) + 3 O2 (g) An impure sample of material contains a small amount of Mg(ClO3)2 . The sample is heated and the gas produced collected by downward displacement of water. A total of 377.1 ml of gas is collected at a temperature of 20.0ºC when the atmospheric pressure is 740.0 torr. [The vapor pressure of water at 20.0ºC is 17.54 torr.]Calculate the number of grams of Mg(ClO3)2 present in the impure sample. Grams of Mg(ClO3)2 : Answer in grams
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1.541x10-4 mol of an unidentified gaseous substance effuses through a tiny hole in 83.7 s. Under identical conditions, 1.909×10-4 mol of argon gas takes 86.0 s to effuse. What is the molar mass of the unidentified substance (in g/mol)? g/mol 1 pts
SF6 can be synthesized by the reaction: SO2(g) + 3 F2(g) → SF6(g) + O2(g)A 1.25-L reaction vessel, initially at 26°C, contains sulfur dioxide gas at a partial pressure of 184 mmHg and fluorine gas at a partial pressure of 511 mmHg. Identify the limiting reactant and determine the theoretical yield of SF6 in grams.
A reaction between liquid reactants takes place at 17.0°C in a sealed, evacuated vessel with a measured volume of 30.0L . Measurements show that the reaction produced 46.g of chlorine pentafluoride gas. Calculate the pressure of chlorine pentafluoride gas in the reaction vessel after the reaction. You may ignore the volume of the liquid reactants. Be sure your answer has the correct number of significant digits. pressure: atm
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