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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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While working in the lab, you find a bottle of white powder labeled "astringent". Since the original investigator neglected to record the identity of the substance, you decide to perform a combustion analysis to identify the compound. You have a 76.8 g sample that when burned produces 139 g CO2 and 24.4 g H2O. What is the empirical formula of this compound? (The compound consists of only C, H, and O.)
A 6.40 g sample of a compound is burned to produce 8.37 g CO, 2.75 g HO, 1.06 g N, and 1.23 g SO. What is the empirical formula of the compound? Give your answer in the form C#H#N#O#S# where the number following the element’s symbol corresponds to the subscript in the formula. (Don’t include a 1 subscript explicitly).
c If you begin with 3.7 mg of Tc metal, what mass of NaTcO4 can be made? What mass of NaOH, in grams, is required to convert all of the HTCO4 into NaTcO4? Mass of NaTcO4 = Mass of NaOH =
What mass of carbon dioxide is produced from the complete combustion of 3.70×10−3 g of methane? Express your answer with the appropriate units.
How many grams of Cl2 are needed to form 76.6 g of AICI, ? 2 Al(s) + 3 Cl, (g) 2 AICI, (s) >
If 36.0 g of C3H8 and 112 g of O2 are placed in a closed container and the mixture is ignited, what is the maximum mass of CO2 that could be produced? The other product of the reaction is water. 68.9 g 74.7 g 86.8 g 92.4 g 108 g
A 3.000 g sample of a gaseous compound was found to contain 2.560 g of carbon and 0.440 g of hydrogen. A) What is the simplest formula of the compound (Write C first and then H)? You won't be able to make the numbers a subscript. For instance, for MgCl2 enter MgCl2. B) The molar mass of the compound was found to be 42.08 g/mol. What is the molecular formula of the compound? You won't be able to make the numbers a subscript. For instance, for MgCl2 enter MgCl2.
11. Elemental phosphorus, P4, reacts vigorously with oxygen to give P4O10. What is the mass of P4O10 that can be produced if 3.75 g of P4 is reacted with 6.55 g of oxygen? If any reagent was in excess, how much of it will be leftover when the reaction is finished?
How many grams of PCl3will be produced by reacting 94.4 g of Cl2 with excess phosphorus if the reaction is only expected to deliver 82.50 % yield? I know that the PCl3 molar mass is 137.33 g.mol and Cl2 molar mass is 70.906. I just don't know where to start with this problem.
A student performed a similar experiment to the one you performed: They took a crucible and lid, cleaned them, heated them over a flame, and after cooling found their combined mass to be 22.538 g. The student then added a sample of zinc(II) sulfate hydrate (ZnSO4·“n”H2O) to the crucible so the combined mass of the sample, crucible, and lid was 25.896 g. They heated this sample for 10 minutes with the lid ajar, let it cool, and measured the mass of the crucible, sample, and lid to be 25.054 g. a. Based on this experiment, what is the formula for they hydrated zinc(II) sulfate compound? b. The student later looked on the reagent bottle for zinc(II) sulfate hydrate and found the actual formula was ZnSO4·7H2O. If everything had been done correctly, what value should the student have expected for the final mass of their sample, crucible, and lid after heating?
If 9.9 × 10²⁵ molecules of CO₂ are produced in a combustion reaction, what is the mass in kg of CO₂ that is produced?
In a combustion analysis experiment, an unknown hydrocarbon produced 69.97749 g of carbon dioxide and 38.19392 g of water. Assume all of the carbon present in the initial sample ends up in the carbon dioxide produced and that all of the hydrogen present in the original sample ends up in the water produced. What is the empirical formula of the hydrocarbon?