Answer:
2.7 °C.kg/mol
Explanation:
Step 1: Calculate the freezing point depression (ΔT)
The normal freezing point of a certain liquid X is-7.30°C and the solution freezes at -9.9°C instead. The freezing point depression is:
ΔT = -7.30 °C - (-9.9 °C) = 2.6 °C
Step 2: Calculate the molality of the solution (b)
We will use the following expression.
b = mass of solute / molar mass of solute × kilograms of solvent
b = 102. g / (162.2 g/mol) × 0.650 kg = 0.967 mol/kg
Step 3: Calculate the molal freezing point depression constant Kf of X
Freezing point depression is a colligative property. It can be calculated using the following expression.
ΔT = Kf × b
Kf = ΔT / b
Kf = 2.6 °C / (0.967 mol/kg) = 2.7 °C.kg/mol
Answer:
Fluorine has seven valence electrons and usually forms the F – ion because it gains one electron to satisfy the octet rule.
Explanation:
Plate tectonics
Explanation:
Natural events primarily responsible for the destruction and creation of landforms on earth are called plate tectonics.
They are simply moving lithospheric plates on the asthenosphere.
- There are three types of plate boundaries which are convergent, divergent and transform.
- A convergent margin is destructive margin where two plates collides against one another. The denser plate gets subducted. Sometimes they have same density and they both get obducted creating some towering peaks where plates are being crushed.
- A divergent margin is a constructive margin. It is a spreading center where new magma erupts to the surface.
- At a transform margin, plates slides past one another.
We can vividly see that plate movement creates and destroys land forms.
learn more:
Lithosphere brainly.com/question/9582362
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