cseiver420
22.04.2020 •
Chemistry
A sample of air contains 78.08% nitrogen, 20.94% oxygen, 0.0500% carbon dioxide, and 0.930% argon by volume. How many molecules of each gas are present in 6.51 L of the sample at 43°C and 1.59 atm? Enter your answers in scientific notation.
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Ответ:
Answer : The number of molecules of nitrogen, oxygen, carbon dioxide and argon is, , , and respectively.
Explanation :
First we have to calculate the total moles of mixture of gas by using ideal gas equation.
where,
P = Pressure of mixture of gas = 1.59 atm
V = Volume of mixture of gas = 6.51 L
n = number of moles mixture of gas = ?
R = Gas constant =
T = Temperature of mixture of gas =
Putting values in above equation, we get:
Now we have to calculate the moles of nitrogen, oxygen, carbon dioxide and argon.
Moles of nitrogen =
Moles of oxygen =
Moles of carbon dioxide =
Moles of argon =
Now we have to calculate the number of molecules of nitrogen, oxygen, carbon dioxide and argon.
As, 1 mole of nitrogen contains number of molecules of nitrogen.
So, 0.312 mole of nitrogen contains number of molecules of nitrogen.
and,
As, 1 mole of oxygen contains number of molecules of oxygen.
So, 0.0836 mole of oxygen contains number of molecules of oxygen.
and,
As, 1 mole of carbon dioxide contains number of molecules of carbon dioxide.
So, 0.000199 mole of carbon dioxide contains number of molecules of carbon dioxide.
and,
As, 1 mole of argon contains number of molecules of argon.
So, 0.00371 mole of argon contains number of molecules of argon.
Therefore, the number of molecules of nitrogen, oxygen, carbon dioxide and argon is, , , and respectively.
Ответ:
The italicized portion of the sentence "looking for unusual flowers" is a present participle phrase ("looking" is the verb in present participle) used after a verb of movent, in this case "walk".
It is used to indicate parallel activity: in this case as they were walking along the mountain path, they were looking for unusual flowers.
The structure is: present participle (looking for) and the object (flowers) which is pre modified by the adjective unusual.