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stich3 [128]
3 years ago
11

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

t; NH3 (aq) +CH3COOH(aq)b. CaO(s) +CO2(g) ---> CaCO3(s)c. NH3(g) +HCl(g) ---> NH4+ (aq) +Cl-(aq)d. C2H4(g) +Br2(l) ---> C2H4Br2(l)
Chemistry
1 answer:
Elden [556K]3 years ago
4 0

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)

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Explanation:

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3 0
2 years ago
Water’s unique properties, high heat capacity, high density, solid phase less dense than liquid phase can be attributed to
Xelga [282]

Answer:

B- The polarity of the molecules and hydrogen bonding between molecules.

Explanation:

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4 0
2 years ago
. Chalk is made of CaCO​ 3​ . How many molecules are in 5 grams of chalk?
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20.02 grams of chalk.

Explanation:

6 0
3 years ago
2. If 1.75 L of a gas is at 700. K and is under 250. kPa of pressure, what will the new
Andrews [41]

Answer:

Final volume is 3.50L

Explanation:

It is possible to find volume of a gas using combined gas law:

\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}

<em>Where P is pressure, V is volume and T is temperature of 1: initial state and 2: final state</em>

If initial state of the gas is:

1.75L of a gas is at 700K and is under 250kPa of pressure

And final state is:

298K and 53.2kPa.

Replacing:

\frac{250kPa*1.75L}{700K} =\frac{53.2kPa*V_2}{298K}

0.625L = 0.1785*V₂

<em>3.50L = V₂</em>

Thus, <em>final volume is 3.50L</em>

3 0
3 years ago
A sample of 450.0 g of water is found to contain 180 mg Cd. What is this concentration in parts per million?
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Answer:

The correct answer is 399.8 ppm

Explanation:

A concentration in parts per million (ppm) is equal to:

1 ppm = \frac{1 g solute}{10^{6}g solution}= \frac{1 mg solute}{1 kg solution}

Solute: Cd; Mass = 180 mg x (1 g/1000 mg) = 0.18 g

Solvent: Water ; Mass= 450.0 g x (1 kg/1000 g) = 0.45 kg

We have the following total mass of solution:

Mass of solution = Mass of solute + Mass of solvent = 0.18 g + 450 g = 450.18 g = 0.45018 kg

Finally, we divide the <u>mass of solute (in mg)</u> into the <u>mass of solution (in kg)</u> to obtain the ppm (in mg/Kg):

ppm = 180 mg/0.45018 kg = 399.8 mg/Kg = 399.8 ppm

4 0
3 years ago
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