<< Chapter < Page Chapter >> Page >

Antimony pentachloride decomposes according to this equation:

SbCl 5 ( g ) SbCl 3 ( g ) + Cl 2 ( g )

An equilibrium mixture in a 5.00-L flask at 448 °C contains 3.85 g of SbCl 5 , 9.14 g of SbCl 3 , and 2.84 g of Cl 2 . How many grams of each will be found if the mixture is transferred into a 2.00-L flask at the same temperature?

Got questions? Get instant answers now!

Consider the reaction between H 2 and O 2 at 1000 K
2H 2 ( g ) + O 2 ( g ) 2H 2 O ( g ) K P = ( P H 2 O ) 2 ( P O 2 ) ( P H 2 ) 3 = 1.33 × 10 20

If 0.500 atm of H 2 and 0.500 atm of O 2 are allowed to come to equilibrium at this temperature, what are the partial pressures of the components?

P H 2 = 8.64 × 10 −11 atm
P O 2 = 0.250 atm
P H 2 O = 0.500 atm

Got questions? Get instant answers now!

An equilibrium is established according to the following equation

Hg 2 2+ ( a q ) + NO 3 ( a q ) + 3 H + ( a q ) 2 Hg 2+ ( a q ) + HNO 2 ( a q ) + H 2 O ( l ) K c = 4.6

What will happen in a solution that is 0.20 M each in Hg 2 2+ , NO 3 , H + , Hg 2+ , and HNO 2 ?

(a) Hg 2 2+ will be oxidized and NO 3 reduced.

(b) Hg 2 2+ will be reduced and NO 3 oxidized.

(c) Hg 2+ will be oxidized and HNO 2 reduced.

(d) Hg 2+ will be reduced and HNO 2 oxidized.

(e) There will be no change because all reactants and products have an activity of 1.

Got questions? Get instant answers now!

Consider the equilibrium

4 NO 2 ( g ) + 6 H 2 O ( g ) 4 NH 3 ( g ) + 7 O 2 ( g )

(a) What is the expression for the equilibrium constant ( K c ) of the reaction?

(b) How must the concentration of NH 3 change to reach equilibrium if the reaction quotient is less than the equilibrium constant?

(c) If the reaction were at equilibrium, how would a decrease in pressure (from an increase in the volume of the reaction vessel) affect the pressure of NO 2 ?

(d) If the change in the pressure of NO 2 is 28 torr as a mixture of the four gases reaches equilibrium, how much will the pressure of O 2 change?

(a) K c = [ NH 3 ] 4 [ O 2 ] 7 [ NO 2 ] 4 [ H 2 O ] 6 . (b) [NH 3 ] must increase for Q c to reach K c . (c) That decrease in pressure would decrease [NO 2 ]. (d) P O 2 = 49 torr

Got questions? Get instant answers now!

The binding of oxygen by hemoglobin (Hb), giving oxyhemoglobin (HbO 2 ), is partially regulated by the concentration of H 3 O + and dissolved CO 2 in the blood. Although the equilibrium is complicated, it can be summarized as

HbO 2 ( a q ) + H 3 O + ( a q ) + CO 2 ( g ) CO 2 Hb H + + O 2 ( g ) + H 2 O ( l )

(a) Write the equilibrium constant expression for this reaction.

(b) Explain why the production of lactic acid and CO 2 in a muscle during exertion stimulates release of O 2 from the oxyhemoglobin in the blood passing through the muscle.

Got questions? Get instant answers now!

The hydrolysis of the sugar sucrose to the sugars glucose and fructose follows a first-order rate equation for the disappearance of sucrose.

C 12 H 22 O 11 ( a q ) + H 2 O ( l ) C 6 H 12 O 6 ( a q ) + C 6 H 12 O 6 ( a q )

Rate = k [C 12 H 22 O 11 ]

In neutral solution, k = 2.1 × 10 −11 /s at 27 °C. (As indicated by the rate constant, this is a very slow reaction. In the human body, the rate of this reaction is sped up by a type of catalyst called an enzyme.) (Note: That is not a mistake in the equation—the products of the reaction, glucose and fructose, have the same molecular formulas, C 6 H 12 O 6 , but differ in the arrangement of the atoms in their molecules). The equilibrium constant for the reaction is 1.36 × 10 5 at 27 °C. What are the concentrations of glucose, fructose, and sucrose after a 0.150 M aqueous solution of sucrose has reached equilibrium? Remember that the activity of a solvent (the effective concentration) is 1.

[fructose] = 0.15 M

Got questions? Get instant answers now!

The density of trifluoroacetic acid vapor was determined at 118.1 °C and 468.5 torr, and found to be 2.784 g/L. Calculate K c for the association of the acid.

Two Lewis structures are shown in a reaction. The first structure, which is condensed, reads, “2 C F subscript 3 C O subscript 2 H ( g ),” and is followed by a double-headed arrow. The second structure shows a partially condensed hexagonal ring shape. From the left side, in a clockwise manner, it reads “C F subscript 3 C, single bond, O, single bond, H, dotted line bond, O, double bond, C F subscript 3 C ( g ), single bond, O, single bond, H, dotted line bond, O, double bond back to the starting compound.”
Got questions? Get instant answers now!

Liquid N 2 O 3 is dark blue at low temperatures, but the color fades and becomes greenish at higher temperatures as the compound decomposes to NO and NO 2 . At 25 °C, a value of K P = 1.91 has been established for this decomposition. If 0.236 moles of N 2 O 3 are placed in a 1.52-L vessel at 25 °C, calculate the equilibrium partial pressures of N 2 O 3 ( g ), NO 2 ( g ), and NO( g ).

P N 2 O 3 = 1.90 atm and P NO = P NO 2 = 1.90 atm

Got questions? Get instant answers now!

A 1.00-L vessel at 400 °C contains the following equilibrium concentrations: N 2 , 1.00 M ; H 2 , 0.50 M ; and NH 3 , 0.25 M . How many moles of hydrogen must be removed from the vessel to increase the concentration of nitrogen to 1.1 M ?

Got questions? Get instant answers now!

A 0.010 M solution of the weak acid HA has an osmotic pressure (see chapter on solutions and colloids) of 0.293 atm at 25 °C. A 0.010 M solution of the weak acid HB has an osmotic pressure of 0.345 atm under the same conditions.

(a) Which acid has the larger equilibrium constant for ionization

HA [ HA ( a q ) A ( a q ) + H + ( a q ) ] or HB [ HB ( a q ) H + ( a q ) + B ( a q ) ] ?

(b) What are the equilibrium constants for the ionization of these acids?

(Hint: Remember that each solution contains three dissolved species: the weak acid (HA or HB), the conjugate base (A or B ), and the hydrogen ion (H + ). Remember that osmotic pressure (like all colligative properties) is related to the total number of solute particles. Specifically for osmotic pressure, those concentrations are described by molarities.)

(a) HB ionizes to a greater degree and has the larger K c .
(b) K c (HA) = 5 × 10 −4
K c (HB) = 3 × 10 −3

Got questions? Get instant answers now!

Questions & Answers

What is stoichometry
ngwuebo Reply
what is atom
yinka Reply
An indivisible part of an element
the smallest particle of an element which is indivisible is called an atom
An atom is the smallest indivisible particle of an element that can take part in chemical reaction
is carbonates soluble
Ebuka Reply
what is the difference between light and electricity
Joshua Reply
What is atom? atom can be defined as the smallest particles
what is the difference between Anode and nodes?
What's the net equations for the three steps of dissociation of phosphoric acid?
Lisa Reply
what is chemistry
Prince Reply
the study of matter
what did the first law of thermodynamics say
Starr Reply
energy can neither be created or distroyed it can only be transferred or converted from one form to another
Graham's law of Diffusion
Ayo Reply
what is melting vaporization
Anieke Reply
melting and boiling point explain in term of molecular motion and Brownian movement
Scientific notation for 150.9433962
Steve Reply
what is aromaticity
Usman Reply
aromaticity is a conjugated pi system specific to organic rings like benzene, which have an odd number of electron pairs within the system that allows for exceptional molecular stability
what is caustic soda
Ogbonna Reply
sodium hydroxide (NaOH)
what is distilled water
is simply means a condensed water vapour
advantage and disadvantage of water to human and industry
Abdulrahman Reply
a hydrocarbon contains 7.7 percent by mass of hydrogen and 92.3 percent by mass of carbon
Timothy Reply
how many types of covalent r there
JArim Reply
how many covalent bond r there
they are three 3
TYPES OF COVALENT BOND-POLAR BOND-NON POLAR BOND-DOUBLE BOND-TRIPPLE BOND. There are three types of covalent bond depending upon the number of shared electron pairs. A covalent bond formed by the mutual sharing of one electron pair between two atoms is called a "Single Covalent bond.

Get the best Chemistry course in your pocket!

Source:  OpenStax, Chemistry. OpenStax CNX. May 20, 2015 Download for free at http://legacy.cnx.org/content/col11760/1.9
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Chemistry' conversation and receive update notifications?