Astrologists use the positions of the stars to make predictions about the future. Why is astrology a pseudoscience?
2 answers:
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Answer:
The buoyant force on the piece of iron is 3.5 newtons.
Explanation:
According to the Archimedes' Principle, the piece of metal experiments a buoyant force equal to the weight of the displaced fluid. By Newton's Laws, we have the following formula:
(1)
Where:
- Buoyant force on the piece of iron, in newtons.
- Weight of the piece of metal, in newtons.
- Weight of the fluid displaced by the piece of metal, in newtons.
If we know that and
, then the buoyant force on the piece of iron is:
The buoyant force on the piece of iron is 3.5 newtons.
Answer: The boiling point of solution is
Explanation:
Elevation in boiling point:
where,
= boiling point of solution = ?
= boiling point of toluene =
= boiling point constant of toluene =
m = molality
i = Van't Hoff factor = 1 (for non-electrolyte)
= mass of solute
= 7.94 g
= mass of solvent (toluene) = 69.2 g
= molar mass of solute
= 254g/mol
Now put all the given values in the above formula, we get:
Therefore, the boiling point (in °C) of a solution is 112.16