Which of the following statements explains the Law of Universal Gravitation?
2 answers:
Answer : The correct option is, Objects in the universe attract each other through gravitational force, depending on their masses and distance between the objects.
Explanation:
Universal law of gravitation : It states that objects in the universe attract each other through the gravitational force, depending on their masses and distance between the objects.
It unit of gravitational force is, N (Newton).
The gravitational force is directly proportional to the masses of the two objects and inversely proportional to the square of the distance between two objects.
Formula used :
where,
G = Gravitational constant
F = gravitational force
and
= masses of two different objects
d = distance between two objects
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Answer: C) 0.020 m
Explanation:
Molality of a solution is defined as the number of moles of solute dissolved per kg of the solvent.
where,
n = moles of solute
= weight of solvent in g
Mole fraction of is =
i.e.
moles of
is present in 1 mole of solution.
Moles of solute =
moles of solvent (water) = 1 - = 0.99
weight of solvent =
Molality =
Thus approximate molality of in this solution is 0.020 m
Answer: The molecular formula of the molecule is
Explanation:
Molecular formula is the chemical formula which depicts the actual number of atoms of each element present in the compound.
The given compound contains one carbon atom, four hydrogen atoms and one oxygen atom.
It is an alcohol with functional group -OH and with molecular formula of named as methanol.
The molecular formula of the molecule is