What is the molarity of a 2.0 L sodium hydroxide solution containing 10.0 grams of solute? 0.80 M 0.13 M 5.0 M 0.25 M
2 answers:
Explanation:
Molarity is defined as the number of moles divided by one liter of solution.
Mathematically, Molarity =
As it is given that volume is 2.0 L and mass is 10.0 grams. Therefore, first we will calculate the number of moles as follows.
No. of moles =
= (molar mass of NaOH = 40 g/mol)
= 0.25 mol
Hence, calculate the molarity of the solution as follows.
Molarity =
=
= 0.125 M
Thus, we can conclude that molarity of given solution is 0.125 M.
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Answer:
The book sitting on the desk
Explanation:
The gravitational potential energy of an object is the energy possessed by the object due to its position relative to the ground.
It is calculated as:
where
m is the mass of the object
g is the acceleration due to gravity
h is the height of the object with respect to the ground
From the formula, we see that the GPE of an object is directly proportional to the heigth h: so, the higher the location of the object, the larger the GPE.
In this problem, we are comparing a book sitting on a desk and the same book sitting on the floor. In the two situations, the mass of the book is the same; however, in the first case, the value of the height is h, while in the second case, the value of h is lower (because the book is located at a lower height, being on the floor).
Therefore, we can conclude that the first book must have a larger GPE, since it has a larger value of h.