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3 years ago

2 Points

Chemistry

1 answer:

oee [108]3 years ago

7 0

Answer:

C would be the most best choice for this question.

Thank you.

If you have any questions, feel free to leave a comment and I will get back to it as soon as I can.

-The Spectre

Explanation:

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What is the coefficient of oxygen (O_2) in the balanced equation for the reaction written below?

Amiraneli [1.4K]

Answer:

1 is your coefficient of oxygen

Explanation:

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3 years ago

Part a cyclohexane has a freezing point of 6.50 ∘c and a kf of 20.0 ∘c/m. What is the freezing point of a solution made by disso

Andrei [34K]

The mathematical expression for the depression in freezing point is given as:

$\Delta T_{f}= k_{f}m$

where, $\Delta T_{f}$ = depression in freezing point

$k_{f}$ = molal depression constant (20.0 $^{o}Ckg/mole$ )

m = molality

Molality is defined as the ratio of number of moles of solute to the kg of the solvent

Number of moles = $\frac{given mass in g}{molar mass}$

given mass of biphenyl solute = 0.925 g

Molar mass of biphenyl = 154.21 g/mol

Put the values,

number of moles of biphenyl = $\frac{0.925 g}{154.21 g/mol}$

= $0.0059 mole$

Molality = $\frac{number of moles of biphenyl solute}{mass of the solvent in kg}$

Mass of cyclohexane solvent = 25.0 g

Convert g into kg: 1 kg = 1000 g

Thus, mass of cyclohexane = $\frac{25.0}{1000}$

= 0.025 kg

Now, put the values in the formula of molality:

Molality = $\frac{0.0059 mole}{0.025 kg}$

= 0.236 mole/kg or 0.236 m.

Calculate the depression in freezing point:

$\Delta T_{f}= 20.0^{o}C kg/mole\times 0.236 mole/kg$

= $4.72 ^{o}C$

Now, $\Delta T_{f} = T_{solvent} - T_{solution}$

$4.72 ^{o}C = 6.50^{o}C - T_{solution}$

$T_{solution} = 6.50^{o}C- 4.72 ^{o}C$

= $1.78^{o}C$

Hence, freezing point of the solution is $1.78^{o}C$ .

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3 years ago

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Baking soda mixed with vinegar produces carbon dioxide and water. The best way to prove that no mass was lost during this reacti

lord [1]

Given what we know, we can confirm that the best way to prove that no mass was lost during the reaction would be to follow option C and determine the masses of all substances before and after the reaction.

<h3>Why is this the best method?</h3>

This method provides two sets of data in order to draw a comparison. The other option will either not produce comparable data, or do not take into account all of the elements being produced.

Therefore, by comparing the mass of baking soda and vinegar before the reaction to the mass of carbon dioxide and water after the reaction, we can analyze the differences if any, and confirm that no mass was lost during the reaction.

To learn more about science visit:

brainly.com/question/7508826?referrer=searchResults

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3 years ago

What is a relative motion

Mice21 [21]

Answer:

The relative velocity is the velocity of an object or observer B in the rest frame of another object or observer A.

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What electron configuration represents Nitrogen? A. 2,2 B. 2,8,4 C. 2,4 D. 2,5