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3 years ago

Which of the following reactions would result in decreased entropy? (multiple choice)

Chemistry

1 answer:

jasenka [17]3 years ago

8 0

Answer:

Explanation:

Since the state of matter is going from a gas to a solid, it would be going from a state of high entropy (greater disorder) to a state of lower entropy (less disorder).

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The ionization constant for acetic acid is 1.8 × 10-5, and that for hydrocyanic acid is 4 × 10-10.

mihalych1998 [28]

Answer:

D. [H+] of the acetic acid solution is greater than that of the hydrocyanic acid solution.

Explanation:

$CH_3 COOH(aq)+ H_2 O(l) CH_3 COO^- (aq)+H_3 O^+ (aq)$

Initial 0.1M 0 0

Change -x +x +x

Equilibrium 0.1M-x +x +x

$Ka =\frac {((x)(x))}{(0.1M-x)}$

$1.8\times10^{-5}= \frac {x^2}{(0.1M-x)}$

(-x is neglected) so we get

$1.8\times10^{-5}\times0.1=x^2\\\\x^2=1.8\times10^{-6}$

$x=\sqrt{x^2}=1.34\times10^{-3} M=H^3 O^{+}$ is the $[H^+ ]$ concnetration of acetic acid

$HCN(aq)+ H_2 O(l) CN^- (aq)+H_3 O^+ (aq)$

Initial 0.1M 0 0

Change -x +x +x

Equilibrium 0.1M-x +x +x

$Ka =\frac {((x)(x))}{(0.1M-x)}$

$4.0\times10^{-10}= \frac {x^2}{(0.1M-x)}$

(-x is neglected) so we get

$4.0\times10^{-10}\times0.1=x^2\\\\x^2=4.0\times10^{-11}$

$x=\sqrt{x^2}=6.32\times10^{-6} M=H^3 O^{+}$ is the $[H^+ ]$ concnetration of Hydrocyanic acid

Thus we see here, [H+] of the acetic acid solution $1.34 \times 10^{-3} M$ is greater than that of the hydrocyanic acid solution $6.32 \times10^{-6} M$

Please note∶

To find $[OH^- ]$ we use formula $[OH^- ]= \frac {kw}{([H^+])}$

The value of kw is 1.0×10^(-14)

The $[OH^- ]$ is lesser in each solution

3 0

3 years ago

There are 3 main process in the water cycle; evaporation, condensation, and precipitation. What energy source starts the process

Black_prince [1.1K]

Answer:

Sun

Explanation:

Every day, many amounts of water evaporate from lakes and rivers, by heat energy from the sun.

8 0

3 years ago

PLEASE HELP

muminat

Answer:

H2O and CO

Explanation:

they both form covalent bonds because none both of the elements are non-metal. Mgo and NaF both have metals in them so they would form ionic bonds.

Covalent bonds, two non-metal

Ionic bonds, a metal and a non-metal

5 0

4 years ago

Read 2 more answers

Can someone help quick

alina1380 [7]

Answer:

Sodium

(Na)

Just count the electrons and search which atom it is.

7 0

3 years ago

What is the mole fraction of oxygen in a gaseous mixture containing 25 grams of oxygen, 15 grams of nitrogen, and 10 grams of he

4vir4ik [10]

Convert all the gases from grams to moles using their molar masses first. Remember that nitrogen and oxygen exist as DIATOMIC gases.

O2 - 25 g / 32 g/mol = 0.78 mol O2
N2 - 15 g / 28.02 g/mol = 0.54 mol N2
He - 10 g / 4.0 g/mol = 2.5 mol He

Add all the moles of gases.

0.78 + 0.54 + 2.5 = 3.82 moles

Divide O2 moles by total moles.

0.78/3.82 = 0.20

7 0

3 years ago