1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Nady [450]
3 years ago
5

Predict whether the changes in enthalpy, entropy, and free energy will be positive or negative for the boiling of water, and exp

lain your predictions. How does temperature affect the spontaneity of this process?
Chemistry
1 answer:
Sedbober [7]3 years ago
4 0

Answer:

ΔH > 0; ΔS >0; ΔG = 0

Not spontaneous when T < 100 °C;

         Equilibrium when T = 100 °C

      Spontaneous when T > 100 °C

Step-by-step explanation:

The process is

H₂O(ℓ) ⇌ H₂O(g)

ΔH > 0 (positive), because we must <em>add heat</em> to boil water

ΔS > 0 (positive), because changing from a liquid to a gas i<em>ncreases the disorder </em>

ΔG = 0, because the liquid-vapour equilibrium process is at <em>equilibrium</em> at 100 °C

ΔG = ΔH – TΔS

Both ΔH and ΔS are positive.

If T = 100 °C, ΔG =0. ΔH = TΔS, and the system is at equilibrium.


If T < 100 °C, the ΔH term will predominate, because T has decreased below the equilibrium value.

ΔG > 0. The process is not spontaneous below 100 °C.


If T > 100 °C, the TΔS term will predominate, because T has increased above the equilibrium value.

ΔG < 0. The process is spontaneous above 100 °C.

You might be interested in
Write the balanced chemical equation for the combustion of ethane, , and answer these questions. (Use the lowest possible coeffi
horrorfan [7]

Answer:

1. 2C2H6 + 7O2 —> 4CO2 + 6H2O

2. 56moles of O2

Explanation:

Ethane undergo Combustion to produce CO2 and H20 according the equation below:

C2H6 + O2 —> CO2 + H2O

Let us balance the equation. There are 6 atoms of H on the left side and 2 atoms on the right side. It can be balanced by putting 3 in front of H2O as shown below:

C2H6 + O2 —> CO2 + 3H2O

There are 2 atoms of C on left and 1atom on the right. It can be balanced by putting 2 in front of CO2 as shown below:

C2H6 + O2 —> 2CO2 + 3H2O

There are a total of 7 atoms of O on the right and 2 atoms on the left. It can be balanced by putting 7/2 in front of O2 as shown below:

C2H6 + 7/2O2 —> 2CO2 + 3H2O

Now we multiply through by 2 to remove the fraction as shown below

2C2H6 + 7O2 —> 4CO2 + 6H2O

Now the equation is balanced

2. 2C2H6 + 7O2 —> 4CO2 + 6H2O

From the equation above,

2 moles of ethane(C2H6) combined with 7moles of O2.

Therefore, 16moles of ethane(C2H6) will combine with = (16x7)/2 = 56moles of O2

3 0
3 years ago
Name the layers of earth in order from most dense to least dense.
Oksi-84 [34.3K]
1. inner core
2. outer core
3. mantle
4.crust
3 0
3 years ago
4. A salvage operator recovered coins believed to be gold. A sample weighed 385.000g and has a volume of 20.0mL. Were the coins
aleksley [76]

Answer:

Gold

Explanation:

We are given that

Mass of sample ,m=385 g

Volume ,V=20mL

We have to find the coin is gold or yellow brass.

We know that

Density=\frac{Mass}{volume}

Using the formula

Density=\frac{385}{20}g/mL

Density=19.25g/mL

Density\approx 19.3g/mL

Density of coin=19.3g/mL

Density of gold=19.3g/mL

Hence, the coin is gold.

5 0
2 years ago
Write a balanced half-reaction for the reduction of dichromate ion cr2o−27 to chromium ion cr 3 in basic aqueous solution. be su
jasenka [17]
Half reaction: Cr₂O₇²⁻(aq) + 7H₂O(l) + 6e⁻ → 2Cr³⁺(aq) + 14OH⁻(aq).
Chromium change oxidation number from +6 in dichromate ion Cr₂O₇²⁻ to +3 in chromium cation.
Sum of the charges on the left side of the half reaction is -2 and on the left side is -8 (2·(+3) +14·(-1)), so six electrons must be added on the left side of half reaction.
6 0
3 years ago
Read 2 more answers
Newton contributed to astronomy by:
SCORPION-xisa [38]

Answer:  D

Explanation:

This is the answer because everyone knows he discovered gravity and he conducted scientific experiments to prove them which he also used math for

Hope this helps

6 0
3 years ago
Read 2 more answers
Other questions:
  • Which of these plants is cassini currently orbiting
    6·1 answer
  • A. What happens when the two atoms are fairly close?
    14·1 answer
  • A gas has ? Please help will appreciate it. Thanks
    10·1 answer
  • Write a balanced chemical equation based on the following description:
    9·1 answer
  • In the Alkali metals what element is the same "Period" as the element Neon
    10·1 answer
  • What is a bowl-shaped crater thought to<br> be caused by the collapse of an empty<br> magma chamber?
    15·1 answer
  • How many g of N in 2.76 g Al(NO3)3
    8·1 answer
  • What if you mix green with blue?
    5·1 answer
  • A compound is 48.6 % C, 8.2 % H, and 43.2 % O by mass. Calculate the empirical formula of this compound.
    14·1 answer
  • How many mL of a 2.50 M K2SO4 solution are required to obtain 1.20 moles of<br> K2SO4?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!