What sequence of events can lead to magma becoming soil
2 answers:
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Answer:
0.08kg
Explanation:
Given parameters:
Temperature of water = 100°C
Quantity of heat released = 180414.08J
Unknown:
Quantity of water condensed = ?
Solution:
This is simple phase change process without any attendant change in temperature.
To solve this problem, use the formula below;
H = mL
H is the heat released
m is mass
L is the latent heat of condensation of water = 2260 kJ/kg
Insert the parameters and solve;
180,414.08 = m x 22.6 x 10⁵ J/kg
m = = 0.08kg
The depression in freezing point is related to molality of solution as follows:
Here, is freezing point depression constant, for cyclohexane it is equal to 20°C kg/mol.
The value of freezing-point depression is 2.5 °C, molality can be calculated as follows:
Molality is defined as number of moles of solute in 1 kg of solvent.
Here, solvent is cyclohexane, its volume is given 20.0 mL and density is 0.779 g/mol thus, mass of cyclohexane can be calculated as follows:
Converting this into kg,
Thus, 15.58 g will be 0.01558 kg.
Now, number of moles of unknown solute is related to its mass and molar mass as follows:
Putting the values of mass of solute which is 0.2436 or 0.0002436 kg
Now, expression for molality of solution is:
Putting all the values,
Or,
On rearranging,
Or,
Therefore, molar mass of unknown sample is 125 g/mol