6. A breathing mixture is prepared in which He is substituted if N2. The gas is 79% He and 21% O2, by volume. (a) What is the density of this mixture in grams per litter at 25°C and 1 atm? (b) At 25°C, what pressure would the He-O2 mixture have the same density as that of air at 25°C and 1 atm? (air composition: 78.08% N2, 20.95%O2, 0.93% Ar, and 0.036% CO2 by volume)

6. A breathing mixture is prepared in which He is substituted if N2. The gas is 79% He and 21% O2, by volume. (a) What is the density of this mixture in grams per litter at 25°C and 1 atm? (b) At 25°C, what pressure would the He-O2 mixture have the same density as that of air at 25°C and 1 atm? (air composition: 78.08% N2, 20.95%O2, 0.93% Ar, and 0.036% CO2 by volume)

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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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

6. A breathing mixture is prepared in which He is substituted if N2. The gas is 79%
He and 21% O2, by volume.
(a) What is the density of this mixture in grams per litter at 25°C and 1 atm?
(b) At 25°C, what pressure would the He-O2 mixture have the same density as that
of air at 25°C and 1 atm? (air composition: 78.08% N2, 20.95%O2, 0.93% Ar,
and 0.036% CO2 by volume)

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