a) Determine the number of molecules found in 5.00 mol of water. B) Calculate the number of moles of lead present in 8.6 × 1017 atoms of Pb. C) Determine the number of oxygen atoms found in 1.75 mol of potassium sulfate, K2SO4.

a) Determine the number of molecules found in 5.00 mol of water. B) Calculate the number of moles of lead present in 8.6 × 1017 atoms of Pb. C) Determine the number of oxygen atoms found in 1.75 mol of potassium sulfate, K2SO4.

Chemistry: An Atoms First Approach

2nd Edition

ISBN:9781305079243

Author:Steven S. Zumdahl, Susan A. Zumdahl

Publisher:Steven S. Zumdahl, Susan A. Zumdahl

Chapter5: Stoichiometry

Section: Chapter Questions

Problem 63E: Freon- 12 (CCI2F2) is used as a refrigerant in air conditioners and as a propellant in aerosol cans....

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Concept explainers

Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.

Question

answer the following questions:

a) Determine the number of molecules found in 5.00 mol of water.

B) Calculate the number of moles of lead present in 8.6 × 1017 atoms of Pb.

C) Determine the number of oxygen atoms found in 1.75 mol of potassium sulfate, K2SO4.

D) Ammonium carbonate is commonly found in smelling salts. Determine the molar mass of (NH4)2CO3.

E) Convert 0.227 mol of potassium sulfate into mass (in grams).

F) A compound was found to contain 33.0% Si and 67.0% F, by mass. If the molar mass of the compound is 170.0 g/mol, calculate its molecular formula.

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