Do all particles pass right through the atoms undeflected?
1 answer:
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Answer:
3.4moles
Explanation:
Given parameters:
Number of molecules = 2.04 x 10²⁴
Unknown: Number of moles
Solution
We use the concept of mole to solve this kind of problem.
A mole is the amount of substance that contains Avogadro's number of particle i.e 6.02 x 10²³ molecules
Solving
For elementary particles:
Number of moles = ¹ molecules
Number of moles =
Number of moles of H₂O = 0.34 x 10¹ = 3.4moles
<u>Answer:</u> The mole fraction of KCl in the solution is 0.044
<u>Explanation:</u>
To calculate the number of moles, we use the equation:
.....(1)
- <u>For KCl:</u>
Given mass of KCl = 43.0 g
Molar mass of KCl = 74.5 g/mol
Putting values in equation 1, we get:
- <u>For water:</u>
Given mass of water = 225 g
Molar mass of water = 18 g/mol
Putting values in equation 1, we get:
To calculate the mole fraction of a substance, we use the equation:
Moles of KCl = 0.58 moles
Moles of water = 12.5 moles
Putting values in above equation:
Hence, the mole fraction of KCl in the solution is 0.044