In which of these statements are protons, electrons, and neutrons correctly compared

A _______ is a repeating disturbance or vibration that transfers or moves energy from place to place without transporting mass.

Harlamova29_29 [7]

The answer is D ( wave )

5 0

3 years ago

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A decorative "ice" sculpture is carved from dry ice (solid CO2) and held at its sublimation point of –78.5°C. Consider the proce

Leno4ka [110]

Answer:

The answers to the questions are;

a. The entropy of sublimation for carbon dioxide (the system) is

134.07 J/Kmol.

b. The entropy of the universe for this reversible process is 376 J/K.

Explanation:

Entropy of sublimation is the entropy change experienced following the transformation of a mole of solid to vapor at the temperature where the sublimation is taking place

a. We note that the mass of the solid CO₂ = 389 g

Molar mass of CO₂ = 44.01 g/mol

Number of moles of CO₂ in the sculpture = Mass/(Molar mass)

= (389 g)/(44.01 g/mol) = 8.84 Moles

Entropy of sublimation is given by

ΔS $_{sublimation}$ = $S_{vapor}$ - S $_{solid}$ = $\frac{\Delta H_{sublimation}}{T}$

Where:

ΔH $_{sublimation}$ = 26.1 KJ/mol

T = Temperature = –78.5°C = ‪194.65‬ K

Therefore the amount of heat required to cause the 389 g of dry ice to sublime = 26.1 KJ/mol × 8.84 Moles = 230.695 KJ

Therefore the entropy of sublimation = ΔS $_{sublimation}$ = $\frac{230.695 KJ}{194.65 K}$

= 1.185 KJ/K

= 1185 J/K = 1185/8.84 J/Kmol = 134.07 J/Kmol

b. The entropy of the universe is given by;

ΔS $_{universe}$ = $\Delta S_{system}$ + ΔS $_{surrounding}$

If the heat absorbed by the system is the same as the heat given off by the surrounding, then we have;

ΔS $_{universe}$ = $\frac{Q}{ T_{system}}$ $-\frac{Q}{T_{surrounding}}$

=1.185 KJ/K - $-\frac{230.695 KJ}{285.15K}$ = 1.185 KJ/K - 0.809 KJ/K = 0.376 KJ/K

= 376 J/K.

7 0

3 years ago

Which of the following reactions takes place with an increase in entropy under standard conditions?a. NH4(aq)+ CH3COO-(aq) ---&g

Elden [556K]

Answer:

a. NH4(aq)+ CH3COO-(aq) ---> NH3 (aq) +CH3COOH(aq)

Explanation:

Entropy -

In a system, the randomness is measured by the term entropy .

Randomness basically refers as a form of energy that can not be used for any work.

The change in entropy is given by amount heat per change in temperature.

When solid is converted to gas entropy increases,

As the molecules in solid state are tightly packed and has more force of attraction between the molecules, but as it is converted to gas, the force of attraction between the molecule decreases and hence entropy increases.

So,

The particles of the substance , if are tightly held by strong force of attraction will decrease the entropy ,

And

If the particles are loosely held , the entropy will increase .

When liquid is converted to solid entropy decreases,

As the molecules in liquid state are loosely packed and has less force of attraction between the molecules, but as it is converted to solid, the force of attraction between the molecule increases and hence entropy decreases.

Hence ,

The order of entropy is -

gas > aqueous > liquid > gas .

Hence, from the question ,

The reaction where there is increase in entropy is -

a. NH₄(aq)⁺ + CH₃COO⁻(aq) ---> NH₃ (aq) + CH₃COOH(aq)

4 0

3 years ago

How many carbon atoms are in 6 molecules of carbon dioxide?

o-na [289]

For CO2 there is one atom of carbon and two atoms of oxygen. For H2O, there is one atom of oxyegen and two atoms of hydrogen. A moleclue can Be made of only one type of atom

4 0

3 years ago

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Does ccl4 has resonance structures

krek1111 [17]

Answer:

No, CCl₄ is 4 covalent C-Cl single bonds with a Tetrahedral geometry.

Explanation:l

For resonance structures to exist the molecule must have alternating single-double bonds. H₂C = CH - CH₃ <=> H₃C - CH = CH₂ resents a simple compound with a resonance structure system. This means that the π-bond electrons are distributed across all carbons in the molecular backbone. I would recommend internet searching for Danial Weeks 'Pushing Electrons' for a comprehensive review of molecular resonance structures. It is a brief, but easy to follow treatment of simple to complex structures containing resonance systems.

Hope this helps. Doc :-)

8 0

2 years ago