When the temperature of a rigid hollow sphere containing 685 L of helium gas is held at 621 K, the pressure of the gas is 1.89 x
1 answer:
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<u>Answer:</u> The mole fraction of Helium is 0.978 and that of oxygen gas is 0.022
<u>Explanation:</u>
To calculate the number of moles, we use the equation:
.....(1)
- <u>For helium:</u>
Given mass of helium = 23 g
Molar mass of helium = 4 g/mol
Putting values in equation 1, we get:
- <u>For oxygen gas:</u>
Given mass of oxygen gas = 4.14 g
Molar mass of oxygen gas = 32 g/mol
Putting values in equation 1, we get:
Mole fraction of a substance is given by:
- <u>For helium:</u>
Moles of helium = 5.75 moles
Total moles = [5.75 + 0.129] = 5.879 moles
Putting values in above equation, we get:
- <u>For oxygen gas:</u>
Moles of oxygen gas = 0.129 moles
Total moles = [5.75 + 0.129] = 5.879 moles
Putting values in above equation, we get:
Hence, the mole fraction of Helium is 0.978 and that of oxygen gas is 0.022
Answer : The time taken for the reaction is, 28 s.
Explanation :
Expression for rate law for first order kinetics is given by :
where,
k = rate constant = 0.0632
t = time taken for the process = ?
= initial amount or concentration of the reactant = 1.28 M
= amount or concentration left time 't' =
Now put all the given values in above equation, we get:
Therefore, the time taken for the reaction is, 28 s.