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3 years ago

When liquid boils, it’s particles get . This may be due to the in pressure.

1 answer:

8 0

Hello !
Hope I am able to help

When liquid boils, it’s particles get___. This may be due to the ___in pressure.
Answer: 1. Further apart
2. Increase

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A 7.50g mass of compound A was added to 35.0g of water and it is found that the freezing point has decreased by 3.14°C. What is

irina1246 [14]

This problem is providing us with the mass of an unknown compound, the mass of water it was added in and the change (decrease) in the freezing point the solution exhibited. Thus, the problem requires the molar mass of the compound, and at the end, the result turns out to be 126.7 g/mol, according to:

<h3>Freezing point depression:</h3>

In chemistry, colligative properties are used to understand how the properties of a solvent change as a solute is added, forming a solution. In this case, we can use the following formula, since the solute decreased water's freezing point:

$\Delta T_m=-m*Kf$

Where the molality is the first variable for us to calculate given the other two:

$m=\frac{-3.14\°C}{-1.86\°C/m} =1.69m$

Thus, since this molality is in moles of solute per kilograms of solvent (water), one can find the former by multiplying the 35.0 g of water, but in kilograms:

$n=\frac{1.69mol}{kg} *35.0g*\frac{1kg}{1000g} =0.0591mol$

Finally, we compute the molar mass as required:

$M=\frac{7.50g}{0.0591mol}\\ \\M=126.9g/mol$

As we assumed this solute is nonionizing.

Learn more about colligative properties: brainly.com/question/10323760

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2 years ago

Which particles that make up an atom are involved in nuclear reactions?.

cestrela7 [59]

Basically nuclear reactions need to involve protons and neutrons and changes in them. So it should be particles within the nucleus. Aka protons and neutrons.

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2 years ago

Why are plastic containers used for storing chemicals in the lab?

lidiya [134]

Because you don't want glass jars because they will break. Plastic containers is the best thing to use

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4 years ago

What is the maximum number of grams of N-acetyl-p-toluidine can be prepared from 70. milliliters of 0.167 M p-toluidine hydrochl

Genrish500 [490]

<u>Answer:</u> The maximum amount of N-acetyl-p-toluidine that can be prepared is 1.7 grams.

<u>Explanation:</u>

To calculate the number of moles for given molarity, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution (in mL)}}$

Molarity of p-toluidine hydrochloride solution = 0.167 M

Volume of solution = 70. mL

Putting values in above equation, we get:

$0.167M=\frac{\text{Moles of p-toluidine hydrochloride}\times 1000}{70}\\\\\text{Moles of p-toluidine hydrochloride}=\frac{0.167\times 70}{1000}=0.0117mol$

The chemical equation for the reaction of p-toluidine hydrochloride and acetic anhydride follows:

$\text{p-toluidine hydrochloride}+\text{Acetic anhydride}\rightarrow \text{N-acetyl-p-toluidine}$

By Stoichiometry of the reaction:

1 mole of p-toluidine hydrochloride produces 1 mole of N-acetyl-p-toluidine

So, 0.0117 moles of p-toluidine hydrochloride will produce = $\frac{1}{1}\times 0.0117=0.0117mol$ of N-acetyl-p-toluidine

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Molar mass of N-acetyl-p-toluidine = 149.2 g/mol

Moles of N-acetyl-p-toluidine = 0.0117 moles

Putting values in equation 1, we get:

$0.0117mol=\frac{\text{Mass of N-acetyl-p-toluidine}}{149.2g/mol}\\\\\text{Mass of N-acetyl-p-toluidine}=(0.0117g/mol\times 149.2)=1.7g$

Hence, the maximum amount of N-acetyl-p-toluidine that can be prepared is 1.7 grams.

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4 years ago

If and electron is heated or electrified, it will give off light energy as it moves from a lower to a higher electron energy lev

rodikova [14]

Answer:

False

Explanation:

When electrons move from lower to higher electron energy level they absorb the energy. When they move from higher to lower energy level they emit energy.

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3 years ago