A common conversion factor is that 22.4 liters of a gas at STP is equal to one mole of that substance.
21 L / 22.4 L = 0.9375 moles of CO2
One mole of any substance contains an Avogadro’s number of atoms: 6.022 x 10^23 atoms/mol.
0.9375 mol x (6.022 x 10^23 atoms/mol) = 5.646 x 10^23 atoms of CO2
21 liters of CO2 contains 5.646 x 10^23 atoms of CO2.
4157 J work is done by the gas , If 2 moles of helium undergo a temperature increase of 100 K at constant pressure.
<h3>What are Noble Gases ?</h3>
The noble gases are helium, argon, krypton, xenon, and radon, in order of their mass.
They are called noble gases because they are so majestic that they do not react with anything in general.
The work done can be calculated by the formula
Q=n Cp ΔT
Cp= ( 1+ f/2)R
R= 8.3144598 J. mol-1.
Cp = (1+3/2) * 8.314
Cp = 5*8.314/2
Q= 2 * 5 *8.314 *100/2
Q = 4157 J
Therefore 4157 J work is done by the gas , If 2 moles of helium undergo a temperature increase of 100 K at constant pressure.
To know more about Noble Gas
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Answer:
First one: group
Second one: period
Third one: number of valence electrons
Last one: increases