Question

Calculate the mass of 0.125 mol of NaOH .

Answer 1

Hint: The inorganic chemical sodium hydroxide, often known as lye or caustic soda, has the formula NaOH. It's a white ionic substance made up of sodium cations $ N{{a}^{+}} $ and hydroxide anions $ O{{H}^{-}} $ . Sodium hydroxide is a caustic base and alkali that decomposes proteins at room temperature and can result in serious chemical burns.

Complete answer:
The mole idea is a practical way of describing a substance's quantity. Any measurement has two parts: the numerical magnitude and the units in which the numerical magnitude is expressed. The magnitude is ‘2' and the unit is ‘kilogramme' when the mass of a ball is measured to be 2 kilogram. The Avogadro constant is the quantity\[6.02214076\times {{10}^{23}}\] that is frequently represented by the sign $ {{N}_{a}} $ . Atoms, molecules, monatomic/polyatomic ions, and other particles are examples of elementary things that may be represented in moles (such as electrons).
 $ \text{No}\text{. of moles = }\dfrac{\text{Given mass}}{\text{Molecular mass}} $
The most official definition of molecular weight is that it is identical with molecular mass; nevertheless, it is also extremely changeable in practise, as are the units used in combination with it.
Atomic mass of Na = 23
Atomic mass of H = 1
Atomic mass of O = 16
Molecular mass of NaOH = 23 + 16 + 1 = 40
Using, $ \text{No}\text{. of moles = }\dfrac{\text{Given mass}}{\text{Molecular mass}} $
\[\text{0}\text{.125 = }\dfrac{\text{Given Mass}}{40}\]
Given mass = 5g .

Note:
The atomic masses of each nuclide present in the molecule are used to determine molecular masses, whereas the standard atomic weights of each element are used to derive molar masses. The isotopic distribution of the element in a given sample is taken into consideration by the standard atomic weight (usually assumed to be "normal").