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Ugo [173]
2 years ago
6

How many molecules are in 0.25 grams of dinitrogen pentoxide?

Chemistry
2 answers:
ZanzabumX [31]2 years ago
7 0

Answer: 0.014\times 10^{23}molecules

Explanation: Moles can be calculated by using the formula:

\text{no of moles}=\frac{\text{given mass}}{\text{Molecular mass}}

\text{no of moles}=\frac{0.25g}{108g/mol}=0.002moles

1 mole of N_2O_5 contains =6.023\times 10^{23}molecules

0.002 mole of N_2O_5 contains =\frac{6.023\times 10^{23}}{1}\times 0.002=0.014\times 10^{23}molecules

Vesna [10]2 years ago
4 0
In order to get the answer, you have to know the formula of how to convert grams to mole and by that you can get the number of molecules.
The answer is 2 moles of N2O5. This is shown by the solution:
(0.25 g N2O5) (1 mol/ 108 g)=2.31 molecules
The answer is 2 molecules.
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Complete the sentence. When an acid is added to water, hydroxide ions __________.
kenny6666 [7]

Answer:

The hydroxide ions decrease.

Explanation:

I got it right on the quiz. This is what I saw. Read this, "Adding water to an acid or base will change its pH. Water is mostly water molecules so adding water to an acid or base reduces the concentration of ions in the solution. When an acidic solution is diluted with water the concentration of H + ions decreases and the pH of the solution increases towards 7."

Hope this helps! Tell me if this is wrong just incase.

8 0
2 years ago
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If a solution at pH 5 undergoes a 1000-fold increase in [OH-], what is the resulting pH?
lara31 [8.8K]
<span>336*280 i believe... i hope  this helps 

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7 0
2 years ago
In some chemical reactions, electrons are transferred from one substance to another, but there is no net gain or loss of electro
Natali [406]

Answer and Explanation:

The equation that depicts oxidation of neutral atom A is  shown below:

\rightarrow A^+ + e^-

This is because one species is losing electrons due to oxidation. The species possesses positively charged after losing electrons, the magnitude of which is proportional to the number of electrons lost.

The net charge will be equivalent on both sides of the equation, too.

Therefore all other options are not correct

The equation that depicts the decline of neutral atom X is

X + e^-  \rightarrow  X^-

It is how a cell gains electrons by reduction. The species obtains a negative charge upon possessing electrons, whose magnitude is equivalent to the amount of electrons gained.

The net charge will be equivalent on both sides of the equation, too.

Therefore all other options are not correct

4 0
2 years ago
A student measures a volume as 25 mL, whereas the correct volume is 23 mL. What is the percent error? * O 8.7% O 0.92% O 0.087%
quester [9]

Answer:

no u

Explanation:

5 0
2 years ago
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A solution is prepared by adding 6.24 g of benzene (C 6H 6, 78.11 g/mol) to 80.74 g of cyclohexane (C 6H 12, 84.16 g/mol). Calcu
tekilochka [14]

Answer:

x_B=0.0769

m=0.990m

Explanation:

Hello,

In this case, we can compute the mole fraction of benzene by using the following formula:

x_B=\frac{n_B}{n_B+n_C}

Whereas n accounts for the moles of each substance, thus, we compute them by using molar mass of benzene and cyclohexane:

n_B=6.24g*\frac{1mol}{78.11g}=0.0799mol\\ \\n_C=80.74g*\frac{1mol}{84.16g} =0.959mol

Thus, we compute the mole fraction:

x_B=\frac{0.0799mol}{0.0799mol+0.959mol}\\ \\x_B=0.0769

Next, for the molality, we define it as:

m=\frac{n_B}{m_C}

Whereas we also use the moles of benzene but rather than the moles of cyclohexane, its mass in kilograms (0.08074 kg), thus, we obtain:

m=\frac{0.0799mol}{0.08074kg}=0.990mol/kg

Or just 0.990 m in molal units (mol/kg).

Best regards.

7 0
2 years ago
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