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ASHA 777 [7]
3 years ago
15

How many molecules are in a 2.1 mol of H2O? *

Chemistry
1 answer:
gayaneshka [121]3 years ago
6 0

Answer:

The mole is the SI unit for amount of a substance.

Explanation:

Just like the dozen and the gross, it is a name that stands for a number. There are therefore 6.02 × 10 23 water molecules in a mole of water molecules.

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Suppose that, from measurements in a microscope, you determine that a certain layer of graphene covers an area of 1.50μm2. Conve
Alex73 [517]
The answer is 1.5*10^-12 square meters. For a detailed calculation, please refer to the attachment.
Download docx
7 0
4 years ago
Need help !!!!! Stuck asap
Step2247 [10]
<h2>Hello!</h2>

The answer is:

Hence, the new pressure will be 2.07 atm.

P_{2}=2.07atm

<h2>Why?</h2>

Since we know that the gas is inside of a rigid container, meaning that the volume will be kept constant, we can solve the problem using the Gay-Lussac's Law.

The the Gay-Lussac's Law establishes that when an ideal gas is kept at the same volume, the pressure and the temperature will be proportional.

We need to pay special attention when we are working with the Gay-Lussac's Law since its equaitons works with absolute temperatures (Kelvin ), so, if we are working with relative temperatures such as Celsius degrees or Fahrenheit degrees, we need to convert the temperatures to Kelvin.

We can convert from Celsius degrees to Kelvin using the following formula:

Temperature(K)=Temperature(C\°)+273

So, we have the Gay-Lussac's equation:

\frac{P_{1}}{T_{1}}=\frac{P_{2}}{T_{2}}

Also, we are given the following information:

T_{1}=30\° \\P_{1}=2atm\\T_{2}=40\°

Therefore, converting the temperature to Kelvin, we have:

T_{1}=30C\°=30+273K=303K\\\\T_{1}=40C\°=40+273K=313K\\

Now, calculating we have:

\frac{P_{1}}{T_{1}}=\frac{P_{2}}{T_{2}}

P_{2}=\frac{P_{1}}{T_{1}}*T_{2}\\\\P_{2}=\frac{2atm}{303K}*313K=2.07atm

Hence, the new pressure will be 2.07 atm.

P_{2}=2.07atm

Have a nice day!

4 0
4 years ago
Heat alwais moves from ____ to _____.
Anton [14]

Answer: left to right

Explanation:

5 0
3 years ago
Read 2 more answers
Which property of isotopes makes them suitable for determining the dates of ancient artifacts? atomic number of the isotope rate
siniylev [52]
Each isotope has a unique rate of decay, making them suitable for determining the dates of ancient artifacts. The answer is "rate of decay of the isotope."
8 0
3 years ago
Which statement applies to electronegativity?
densk [106]

<u>Answer:</u> The correct answer is Option A.

<u>Explanation:</u>

Electronegativity is defined as the tendency of an atom to attract the shared pair of electrons towards itself whenever a bond is formed.

This property increases as we move from left to right across a period because the number of charge on the nucleus gets increased and electrons are attracted more towards the nucleus.

This property decreases as we move from top to bottom in a group because the electrons get add up in the new shells which make them further away from the nucleus.

Thus, the correct answer is Option A.

7 0
3 years ago
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