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4 years ago

PLEASE HELP

Chemistry

2 answers:

prisoha [69]4 years ago

8 0

Answer:

Explanation:

In this problem, a 10 - 10 M solution of HCl contributes 10 - 10 M [H +]. The ionization of water contributes 10 - 7 M [H +].

Leto [7]4 years ago

8 0

Answer:

Explanation:

HCl ⟶ H⁺ + Cl⁻

HCl dissociates completely in solution, so

1.0 × 10⁻⁴ mol·L⁻¹ HCl ⟶ 1.0 × 10⁻⁴ mol·L⁻¹ H⁺

pH = -log(H⁺) = -log(1.0 × 10⁻⁴) = -log(1.0) - log(10⁻⁴)= -0 - log(-4) = -(-4) = 4

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Afina-wow [57]

Maybe you can try to reduce the amount of electricity you use, that should be easy to fill out :)

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3 years ago

Read 2 more answers

What is the mole fraction of each component in a solution made by mixing 300 g of ethanol(C2H5OH) and 500 g of water?

Snowcat [4.5K]

Answer:

The mole fraction of ethanol and water in the solution are 0.19 and 0.81 respectively.

Explanation:

The Molar Fraction is a way of measuring the concentration that expresses the proportion in which a substance is found with respect to the total moles of the solution, which are calculated by adding the moles of solute (s) and solvent.

It is calculated by dividing the number of moles of one of the components by the total number of moles of the solution.

The sum of all the molar fractions of the substances present in a solution is equal to 1.

So, the expression to calculate the mole fraction is:

$Molar fraction (Xi)=\frac{moles of sudstance}{total moles of the solution}$

Being the molar mass of the compounds:

Ethanol 46 $\frac{g}{mol}$

Water 18 $\frac{g}{mol}$

the number of moles that represent the mass quantities is calculated as:

Moles of ethanol: 300 grams* $\frac{1 mol}{46 grams}$ = 6.52 moles
Moles of water: 500 grams* $\frac{1 mol}{18 grams}$ = 27.78 moles

So the total moles in solution are 6.52 moles + 27.78 moles = 34.3 moles

The mole fraction of ethanol in the solution is calculated as:

$mole fraction of ethanol=x_{ethanol} =\frac{6.52 moles}{34.3 moles}$

$x_{ethanol} =0.19$

The mole fraction of water in the solution is calculated as:

$mole fraction of water=x_{water} =\frac{27.78 moles}{34.3 moles}$

$x_{water} =0.81$

Then:

$x_{water} +x_{ethanol} = 0.81 + 0.19$

$x_{water} +x_{ethanol} =1$

<u><em>The mole fraction of ethanol and water in the solution are 0.19 and 0.81 respectively.</em></u>

8 0

3 years ago

You have a glass of pure water and add acidic lemon juice to it. This means that you are adding _____ to it, and the solution wi

mr Goodwill [35]

Answer: acid; acidic

Explanation:

You have a glass of pure water and add acidic lemon juice to it. This means that you are adding ACID to it, and the solution will become ACIDIC.

Pure water has a pH value of 7

Lemon juice has a pH value less than 7 i.e acidic

Therefore, addition of lemon juice to pure water will drop the latter pH from 7 to form a final solution that is ACIDIC.

8 0

3 years ago

What happens first during cellular respiration

Yuliya22 [10]

Answer:

glcolysis

Explanation:

Glcolysis uses glucose to create ATP within the cytoplasm of the cell.

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3 years ago

Which of the following is a chemical change? Explain your reasoning: (a) boiling canned soup; (b) toasting a slice of bread; (c)

schepotkina [342]

Answer:

(d) burning a log.

(b) toasting a slice of bread;

Explanation:

Chemical change -

A chemical change refers to , the change in which a new compound is formed .

From the question ,

boiling canned soup ,

Its is not a chemical process , since no new compound is formed , these is only change in state as the liquid is turning to gaseous sate .

Chopping a log ,

It is not a chemical process , as no new substance is formed .

toasting a slice of bread

It is a chemical change , in which bread surface is deposited by a brown coat via the process of heating , even this process is a irreversible in nature .

burning of log ,

It is a chemical change , as with the help of heating , the wood is turning to ashes .

6 0

3 years ago