2. A student used a piece of aluminum that had a mass of 2.583 grams, and treated according to the same procedure you used in this experiment. 2 A1(s)+2 KOH(aq) + 4 H2SO4(aq) +22 H200) 2 KAI(SO4)2 12H20(s) +3 H2(g) How many moles of Al did the student use in this experiment? a. How many moles of the Alum, KAI(SO42 * 12 H20, Use the coefficients from the balanced chemical equation.) b. can be produced theoretically? (Hint- What is the mass of Alum theoretically possible? (Hint - Use the molar mass of the alum calculated in question #1.) c. d. If the student's crystals had a mass of 32.105 g, what is the percent yield?

2. A student used a piece of aluminum that had a mass of 2.583 grams, and treated according to the same procedure you used in this experiment. 2 A1(s)+2 KOH(aq) + 4 H2SO4(aq) +22 H200) 2 KAI(SO4)2 12H20(s) +3 H2(g) How many moles of Al did the student use in this experiment? a. How many moles of the Alum, KAI(SO42 * 12 H20, Use the coefficients from the balanced chemical equation.) b. can be produced theoretically? (Hint- What is the mass of Alum theoretically possible? (Hint - Use the molar mass of the alum calculated in question #1.) c. d. If the student's crystals had a mass of 32.105 g, what is the percent yield?

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

Chapter3: Stoichiometry

Section: Chapter Questions

Problem 175CP: When the supply of oxygen is limited, iron metal reacts with oxygen to produce a mixture of FeO and...

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If you had a mole of U.S. dollar bills and equally distributed the money to all of the people of the world, how rich would every person be? Assume a world population of 7 billion.
There are five hydrocarbon compounds (compounds of C and II) that have the formula C6H14. (These are isomers; they differ in the way that C and H atoms are attached. Chapter 23) All are liquids at room temperature but have slightly different densities. (a) You have a pure sample of one of these hydrocarbons, and to identify it you decide to measure its density. You determine that a 5.0-mL sample (measured in a graduated cylinder) has a mass of 3.2745 g (measured on an analytical balance). Assume that the accuracy of the values for mass and volume is plus or minus one ( 1) in the last significant figure. What is the density of the liquid? (b) Can you identify the unknown hydrocarbon based on your experiment? (c) Can you eliminate any of the five possibilities based on the data? If so, which one(s)? (d) You need a more accurate volume measurement to solve this problem, and you redetermine the volume to be 4.93 mL Based on this new informationwhat is the unknown compound?
A sample of cocaine, C17H21O4N, is diluted with sugar, C12H22O11. When a 1.00-mg sample of this mixture is burned, 1.00 mL of carbon dioxide (d=1.80g/L) is formed. What is the percentage of cocaine in this mixture?
3.80 Which one of the following metal samples cannot possibly exist? not? (a) a piece of gold foil 10-6 m thick (b) 5 mg of platinum (c) 10-24 mol of aluminum (d) a copper wire 0.1 mm in diameter
3.107 As computer processor speeds increase, it is necessary for engineers to increase the number of circuit elements packed into a given area. Individual circuit elements are often connected using very small copper “wires” deposited directly onto the surface of the chip. In some processors, these copper interconnects are about 22 nm wide. How many copper atoms would be in a 1-mm length of such an interconnect, assuming a square cross section? (The density of copper is 8.96 g/cm3.)
The Statue of Liberty in New York harbor is made of 2.00 105 lb copper sheets bolted to an iron framework. Calculate the mass and the amount of copper in the statue (1 lb = 454 g).
3.68 Magnesium is lighter than other structural metals, so it is increasingly important in the design of more efficient vehicles. Mg2+ ions are present in seawater, and the metal is often prepared by "harvesting" these ions and converting them to Mg metal. The average magnesium content of the oceans is about 1270 g Mg2+ per ton of seawater, and the density of seawater is about 1.03 g/mL. What is the molarity of Mg2+ ions in seawater? The design for a concept car calls for 103 kg of magnesium per vehicle. How many gallons of seawater would be required to supply enough magnesium to build one of these ears?
When the supply of oxygen is limited, iron metal reacts with oxygen to produce a mixture of FeO and Fe2O3. In a certain experiment, 20.00 g iron metal was reacted with 11.20 g oxygen gas. After the experiment, the iron was totally consumed, and 3.24 g oxygen gas remained. Calculate the amounts of FeO and Fe2O3 formed in this experiment.
When M2S3(s) is heated in air, it is converted to MO2(s). A 4.000-g sample of M2S3(s) shows a decrease in mass of 0.277 g when it is heated in air. What is the average atomic mass of M?
A 1.680-g sample of coal contains 1.584 g C. Calculate the mass percentage of C in the coal.
Hemoglobin is the oxygen-carrying molecule of red blood cells, consisting of a protein and a nonprotein substance. The nonprotein substance is called heme. A sample of heme weighing 35.2 mg contains 3.19 mg of iron. If a heme molecule contains one atom of iron, what is the molecular weight of heme?
Consider the equation 2A + B . A2B. If you mix 1.0 mole of A with 1.0 mole of B, what amount (moles) of A2B can be produced?

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