Answer:
The freezing point for the solution is -64.09°C
Explanation:
This problem can be solved, by the freezing point depression. This colligative problem shows, that the freezing point of a solution is lower than the freezing point of pure solvent.
ΔT = Kf. m
ΔT = T° freezing pure solvent - T° freezing solution
Kf = Cryscopic constant, for chloroform is 4.68
T°freezing pure solvent = -63.5°C
m is mol/kg of solvent → molality
Let's determine the moles of benzene
1.25 g / 78 g/mol = 0.0160 mol
Let's convert the mass of solvent to kg
125 g . 1kg / 1000 g = 0.125 kg
m = 0.0160 mol / 0.125 kg → 0.128 m
Let's go to the formula to replace the data
-63.5°C - T° freezing solution = 4.68 °C/m . 0.128 m
T° freezing solution = - (4.68 °C/m . 0.128 m + 63.5°C)
T° freezing solution = - 64.09°C
Answer:
51 J
Explanation:
The air inside a bicycle tire pump has 27 joules of heat conducted away. By convention, when heat is released, it takes the negative sign, so Q = -27 J.
77.9 joules of work done are being done on the air inside a bicycle tire pump. By convention, when work is being done on the system, it takes the positive sign, so W = 77.9 J
We can calculate the change in the internal energy (ΔU) using the following expression.
ΔU = Q + W
ΔU = (-27 J) + 77.9 J
ΔU = 51 J
values of the quantum numbers: -6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6
location of the electron: In the 7th energy level away from the nucleus.
Explanation:
From the description of the problem, the magnetic number is given is as -6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6 and the electron is located in the 7th energy level away from the nucleus. Basically, the problem is testing for the understanding of the principal quantum numbers which gives the location of electrons and the magnetic quantum number that shows the spatial orientation of the orbitals.
The orbital designation of the describe electron is 7d
- Magnetic quantum number is limited by the azimuthal quantum number which is the quantum number describing the possible shapes. The azimuthal is given as L= n-1. "n" is the principal quantum number which is 7. Therefore L is 6 and the magnetic quantum numbers are -6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6
- The position of the electron is given by the principal quantum number which represents the main energy level in which the orbital is located or the average distance from the nucleus. Here it is 7.
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I think that the answer is 1/8 Hope this helps!!!! :D
V = 60.0 g/ 0.70 g/mL = 85.7 mL Hope this helps! ;D
