Given: Initial volume of 
gas= 15.0 L
Pressure=1.50 atm
Temperature=23°C
Use ideal gas equation as follows:
Here, P is pressure, V is volume, n is number of moles, R is Universal gas constant and T is temperature in Kelvin.
First convert the given temperature in Kelvin.
0°C=273.15 K
Thus, 23 °C=296.15 K
Rearranging ideal gas equation to calculate the value of nR as follows:
Now, final pressure is 3.50 atm and temperature is 286°C, converting the temperature into Kelvin,
0°C=273.15 K
Thus, 286 °C=559.15 K
Volume can be calculated using the ideal gas equation as follows:
Putting the value of given pressure and temperature and the above calculated value of nR,
Therefore, volume of at 3.50 atm and 286°C is 12.14 L.
Check the circled atoms in the attached diagram
Explanation:
The circled options all belongs to the same elements. They are simply isotopes.
Since:
Red ball = protons
Yellow ball = neutron
Blue ball = electron
The protons are positively charged and with the neutrally charged neutrons they both occupy the vicinity of the nucleus of an atom.
Electrons moves round the nucleus in orbits.
Atoms of the same elements have the same number of protons.
The circled options all have two protons.
The atoms only differ in the number of neutrons which signifies that they are merely isotopes.
More descriptively, the atoms are Helium atoms.
learn more:
Isotope brainly.com/question/4551913
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In the given question we need to convert 0.075 meter into centimeter. For this purpose we need to know the relation between meter and centimeter. Then only this problem can be solved and the correct answer reached.
Now we know that
1 meter = 100 centimeter
Then
0.075 meter = [(100/1) * 0.075] centimeter
We know that any number when divided by 1 gives the same number.
So
0.075 meter = (100 * 0.075) centimeter
= (100 * 75/1000) centimeter
= (7500/1000) centimeter
= (75/10) centimeter
= 7.5 centimeter.
So from all the given options the correct answer to the question is 7.5 centimeter.
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