# 9.3 Stoichiometry of gaseous substances, mixtures, and reactions  (Page 7/13)

 Page 7 / 13

## Susan solomon

Atmospheric and climate scientist Susan Solomon ( [link] ) is the author of one of The New York Times books of the year ( The Coldest March , 2001), one of Time magazine’s 100 most influential people in the world (2008), and a working group leader of the Intergovernmental Panel on Climate Change (IPCC), which was the recipient of the 2007 Nobel Peace Prize. She helped determine and explain the cause of the formation of the ozone hole over Antarctica, and has authored many important papers on climate change. She has been awarded the top scientific honors in the US and France (the National Medal of Science and the Grande Medaille, respectively), and is a member of the National Academy of Sciences, the Royal Society, the French Academy of Sciences, and the European Academy of Sciences. Formerly a professor at the University of Colorado, she is now at MIT, and continues to work at NOAA.

## Key concepts and summary

The ideal gas law can be used to derive a number of convenient equations relating directly measured quantities to properties of interest for gaseous substances and mixtures. Appropriate rearrangement of the ideal gas equation may be made to permit the calculation of gas densities and molar masses. Dalton’s law of partial pressures may be used to relate measured gas pressures for gaseous mixtures to their compositions. Avogadro’s law may be used in stoichiometric computations for chemical reactions involving gaseous reactants or products.

## Key equations

• P Total = P A + P B + P C + … = Ʃ i P i
• P A = X A P Total
• ${X}_{A}=\phantom{\rule{0.2em}{0ex}}\frac{{n}_{A}}{{n}_{Total}}$

## Chemistry end of chapter exercises

What is the density of laughing gas, dinitrogen monoxide, N 2 O, at a temperature of 325 K and a pressure of 113.0 kPa?

Calculate the density of Freon 12, CF 2 Cl 2 , at 30.0 °C and 0.954 atm.

4.64 g L −1

Which is denser at the same temperature and pressure, dry air or air saturated with water vapor? Explain.

A cylinder of O 2 ( g ) used in breathing by emphysema patients has a volume of 3.00 L at a pressure of 10.0 atm. If the temperature of the cylinder is 28.0 °C, what mass of oxygen is in the cylinder?

38.8 g

What is the molar mass of a gas if 0.0494 g of the gas occupies a volume of 0.100 L at a temperature 26 °C and a pressure of 307 torr?

What is the molar mass of a gas if 0.281 g of the gas occupies a volume of 125 mL at a temperature 126 °C and a pressure of 777 torr?

72.0 g mol −1

How could you show experimentally that the molecular formula of propene is C 3 H 6 , not CH 2 ?

The density of a certain gaseous fluoride of phosphorus is 3.93 g/L at STP. Calculate the molar mass of this fluoride and determine its molecular formula.

88.1 g mol −1 ; PF 3

Consider this question: What is the molecular formula of a compound that contains 39% C, 45% N, and 16% H if 0.157 g of the compound occupies l25 mL with a pressure of 99.5 kPa at 22 °C?

(a) Outline the steps necessary to answer the question.

what is periodic chemistry
Le chatelier's principle
how many isotopes does hydrogen have
3 isotopes
FLIMZEE
3 isotopes
FLIMZEE
an lmportant medical use of nuclear radiation is
the minimum amount of energy required for effective collosion btw reacting particle is known as
Faith
the minimum amount of energy required for effective collosion btw reacting particle is known as
Faith
hi
Best
hmmmmm
Aniebiet
the minimum amount of energy required for effective collosion btw reacting particle is known as
Faith
Hey
Faith
hi
Nag
how do I get MCQs and essay to work?
I want spectroscopy
Nipun
Check on play store Maybe you'll get an app for that
Idrissa
what is electrolysis
state the periodic law
the modern periodic state dat element are arranged in row and column according to their atomic number
lola
what is chemistry
chemistry is the brach of science which deal with composition and dicomposion of matter
ezekier
What are the branchs of chemistry
Blessing
What is matter
matter is anything that has mass or weight and accopies space
ezekier
what is endothermic
something that absorbs some form energy
mohammed
What is gas law
law is the rule of government
Dawite
gas law I have no idea
Israel
There are different Gas Laws There's boyles law, Charles law... Etc
Kanji
can you be more specific
Allyson
wat is hydroxyl
James
why is borontrihydride considered a Lewis acid
electronic configuration
What is chemistry
it's is a branch of science that deals with the nature and composition of various matters and how the under go changes
Kelly
Pls what is the structural formula for propanonitrile
chemistry is the study of the interaction, structure and properties of matter
Olaiya
If a man has a mass of 115 pounds,what is his mass in gram lb=453.6g?
Henok