1. In a certain compound of copper and oxygen, CuxOy, we find that a sample weighing0.6349 g contains 0.5639 g of Cu. What is the mole ratio (number of moles Cu/numberof moles O) in the sample? Write the resulting Empirical Formula.2. In a certain compound of chromium, chlorine, and water, CrxClyoz H₂O, we find that asample weighing 20.0000 g contains 3.9082 g of Cr and 8.1136 g of water. What is themole ratio (number of moles Cr/number of moles Cl and number of moles Cr/number ofmoles of H₂O) in the sample? Write the resulting Empirical Formula.3. A carbohydrate sample weighing 5.0000 g with a formula of CxHyO₂ is dehydrated toleave 2.0001 g of C. What is the mole ratio (moles of C/ moles of water) in the sample?Write the resulting Empirical Formula.

Molar mass of copper = 63.646 g/molMolar mass of oxygen = 16 g/molTotal mass of sample = 0.6349…

1. In a certain compound of copper and oxygen, CuxOy, we find that a sample weighing 0.6349 g contains 0.5639 g of Cu. What is the mole ratio (number of moles Cu/number of moles O) in the sample? Write the resulting Empirical Formula.

1. In a certain compound of copper and oxygen, CuxOy, we find that a sample weighing 0.6349 g contains 0.5639 g of Cu. What is the mole ratio (number of moles Cu/number of moles O) in the sample? Write the resulting Empirical Formula.

Chemical Principles in the Laboratory

11th Edition

ISBN:9781305264434

Author:Emil Slowinski, Wayne C. Wolsey, Robert Rossi

Publisher:Emil Slowinski, Wayne C. Wolsey, Robert Rossi

Chapter33: Preparation Of Copper(i) Chloride

Section: Chapter Questions

Problem 5ASA

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Stoichiometry

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Question

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1. In a certain compound of copper and oxygen, CuxOy, we find that a sample weighing
0.6349 g contains 0.5639 g of Cu. What is the mole ratio (number of moles Cu/number
of moles O) in the sample? Write the resulting Empirical Formula.
2. In a certain compound of chromium, chlorine, and water, CrxClyoz H₂O, we find that a
sample weighing 20.0000 g contains 3.9082 g of Cr and 8.1136 g of water. What is the
mole ratio (number of moles Cr/number of moles Cl and number of moles Cr/number of
moles of H₂O) in the sample? Write the resulting Empirical Formula.
3. A carbohydrate sample weighing 5.0000 g with a formula of CxHyO₂ is dehydrated to
leave 2.0001 g of C. What is the mole ratio (moles of C/ moles of water) in the sample?
Write the resulting Empirical Formula.

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