16. What is the volume of a gas at STP?1.0L2.4L22.4L17. What is the pressure of a 2.25L container that hold 1.25 moles of helium at299K? (R = 0.08206 L atm/K mol) *40.9 atm30.7 atm13.6 atm4.2 atm18. Reacting 8.85 g of SiO2 with excess carbon produces 2.25g of SiC. What is thepercent yield? SiO2 + 3C --> SiC + 2CO *90%45%82%38%

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Introductory Chemistry: A Foundation

8th Edition

ISBN:9781285199030

Author:Steven S. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Donald J. DeCoste

Chapter13: Gases

Section: Chapter Questions

Problem 98QAP

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Concept explainers

Matter and Measurement

In the universe, there is matter, energy, and void space. The universe contains energy and void space. The definition of matter can be considered as something which possesses mass and consumes space. Chemistry is that branch of science which deals with the study of matter. Under chemistry, nature, composition, and the changes occurring to matter are discussed.

Question

16. What is the volume of a gas at STP?
1.0L
2.4L
22.4L
17. What is the pressure of a 2.25L container that hold 1.25 moles of helium at
299K? (R = 0.08206 L atm/K mol) *
40.9 atm
30.7 atm
13.6 atm
4.2 atm
18. Reacting 8.85 g of SiO2 with excess carbon produces 2.25g of SiC. What is the
percent yield? SiO2 + 3C --> SiC + 2CO *
90%
45%
82%
38%

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