Answer:
Shorter waves vibrate at higher frequencies and have higher energies. Red light has a frequency of around 430 terahertz, while blue's frequency is closer to 750 terahertz. Red photons of light carry about 1.8 electron volts (eV) of energy, while each blue photon transmits about 3.1 eV.
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The question is incomplete, here is the complete question:
Calculate the mole fraction of the ionic species KCl in the solution A solution was prepared by dissolving 43.0 g of KCl in 225 g of water.
<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)
Given mass of water = 225 g
Molar mass of water = 18 g/mol
Putting values in equation 1, we get:
Given mass of KCl = 43 g
Molar mass of KCl = 74.55 g/mol
Putting values in equation 1, we get:
Mole fraction of a substance is given by:
Moles of KCl = 0.577 moles
Total moles = [0.577 + 12.5] = 13.077 moles
Putting values in above equation, we get:
Hence, the mole fraction of KCl in the solution is 0.044
Answer:
The balanced equation would be:
3AgNO3+Al→3Ag+Al(NO3)3
Explanation:
Answer:
Spring constant: .
Work done: .
Explanation:
Convert all values to SI units.
- Length change: ;
- Mass of the weight: .
Assume that the spring-mass system is vertical and is placed on the surface of the earth. The gravitational acceleration constant will be equal to .
Gravitational pull on the weight:
.
That's also the size of the force on the spring. .
The spring constant is the size of the force required to deshape the spring (by stretching, in this case) by unit length.
.
Assume that there's no energy loss in this process. The work done on the spring is the same as the elastic potential energy that it gains:
.