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3 years ago

Entropy increase from solid to liquid to gas. T/F

Chemistry

2 answers:

mariarad [96]3 years ago

8 0

Answer: True

Explanation:

Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.

$\Delta S$ is positive when randomness increases and $\Delta S$ is negative when randomness decreases.

When the solid changes to liquid to gas ,the randomness of particles increases and hence $\Delta S$ is positive and thus the entropy increases.

e-lub [12.9K]3 years ago

5 0

Answer:

True

Explanation:

Entropy is a measure that is used to calculate the amount of energy in the particles, this is related to the temperature of the particles and how they are capable of perform work, if the randomness in the particles of the element increases the entropy increases and the more movement there is in the substance the higher the temperature and the randomness as you know changing from solid to liquid, or to gas, the temperature needs to increase as well as the randomness.

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Determine the point groups for a. Ethane (staggered conformation) b. Ethane (eclipsed conformation) c. Chloroethane (staggered c

BlackZzzverrR [31]

Answer and Explanation:

Every molecule has a set of symmetry operations that helps in determining its overall symmetry. This set of operations determines the point group of a molecule.

(a) Ethane (staggered conformation)

Ethane in the staggered conformation has:

two $C_{3}$ axis (the C-C line)
3 perpendicular $C_{2}$ rotational axis bisecting the C-C line, in the plane of the two C's and H's on the opposite sides of the two C's
no σ $_{h}$ plane
but has 3σ $_{d}$ planes containing two carbons and anti two hydrogens

hence the point group of ethane in staggered conformation is  $D_{3d}$ 

(b) Ethane (eclipsed conformation)

Ethane in the eclipsed conformation has:

two $C_{3}$ axis (the C-C line)
three perpendicular $C_{2}$ axis (in the plane of the two C's and H's on the same side of the two C's)
mirror planes include σ $_{h}$ and 3σ $_{d}$

Hence the point group of ethane in eclipsed conformation is $D_{3h}$

(c) chloroethane (staggered conformation)

Chloroethane in the staggered conformation has:

no rotational axis

σ plane containing two carbons and chlorine and the anti hydrogen of Cl

Hence the point group of staggered conformation in chloroethane is $C_{s}$

(c) 1,2-Dichloroethane (staggered anti conformation)

1,2-Dichloroethane in the staggered anti conformation has:

$C_{2}$ axis perpendicular to the C-C bond and perpendicular to the plane of Cl-C-C-Cl
contain a σ $_{h}$ plane through Cl-C-C-Cl, and an inversion centre

Hence the point group in the staggered anti conformation of 1,2-Dichloroethane is $C_{2h}$

6 0

3 years ago

How many moles are in 1.93x1023 particles of Na3PO4?

Tresset [83]

Answer:

<h3>The answer is 0.32 moles</h3>

Explanation:

To find the number of moles given the number of entities we use the formula

$n = \frac{N}{L} \\$

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question

N = 1.93 × 10²³ particles

We have

$n = \frac{1.93 \times {10}^{23} }{6.02 \times {10}^{23 } } \\ = 0.320598006...$

We have the final answer as

<h3>0.32 moles</h3>

Hope this helps you

6 0

3 years ago

Read 2 more answers

How many liters of 4.0 NaOH solution will react with 1.8 mol H2SO4

wlad13 [49]

Answer:

0.9 liters of 4.0 M NaOH solution will react with 1.8 moles of sulfuric acid.

Explanation:

$2NaOH(aq)+H_2SO_4(aq)\rightarrow Na_2SO_4(aq)+2H_2O(l)$

According to reaction, 1 mole of sulfuric acid reacts with 2 moles of sodium hydroxide.

Then 1.8 moles of sulfuric acid will react with:

$\frac{2}{1}\times 1.8 mol=3.6 mol$ moles of NaOH.

Molarity of NaOH = 4.0 M

Moles of NaOH= n = 3.6 mol

Volume of NaOH = V

$M=\frac{n}{V(L)}$

$V=\frac{n}{M}=\frac{3.6 mol}{4.0 M}=0.9 L$

0.9 liters of 4.0 M NaOH solution will react with 1.8 moles of sulfuric acid.

8 0

3 years ago

A) what is hydrogen's carrying capacity? b) what is lithium’s carrying capacity?

sladkih [1.3K]

Answer:

A)Hydrogen can be stored physically as either a gas or a liquid. Storage of hydrogen as a gas typically requires high-pressure tanks (350–700 bar [5,000–10,000 psi] tank pressure). Storage of hydrogen as a liquid requires cryogenic temperatures because the boiling point of hydrogen at one atmosphere pressure is −252.8°C.

B) carrying capacity of the lithium reserve will reach 10 million EV and 90 billion CE's RLBs for 50% recycling of lithium-containing waste, and 15 million EV and 150 billion CE's RLBs for 90% recycling.

Explanation:

Hope this helped Mark BRAINLEST!!

3 0

3 years ago

PLEASE I NEED HELP NOW!!! I WILL GIVE 25 POINTS

padilas [110]

If I did this correctly the balanced equation would be:
14H⁺+Cr₂O₇²⁻+6I⁻→3I₂+2Cr³⁺+7H₂O

oxidation half: (iodide was oxidized)
2I⁻→I₂+2e⁻

reduction half: (chromium was reduced)
14H⁺+Cr₂O₇²⁻+6e⁻→2Cr³⁺+7H₂O

H⁺ comes from the solution. It is in the final reaction since in redox reactions the oxygen is turned into water since it can't just go away. I multiplied the oxidation half reaction by 3 in order for both half reactions to half the same number of electrons since equal numbers of electrons need to be lost and gained for the reaction to be balanced.

I hope this helps. Let me know if anything is unclear.

8 0

3 years ago