Question

Given, 1.5 g of oxygen is produced by heating $KCl{{O}_{3}}$. How much KCl is produced in the reaction?
A.$4.15\times {{10}^{-2}}$mole
B.4.33 g
C.0.0313 mole
D.2.332 g

Answer 1

Hint: Before answering this question, we should know what is the number of moles and their formula. The mass of a substance that contains an equal amount of basic units is known as mole. The formula of it is number of moles = \[\dfrac{Mass\,of\,the\,subs\tan ce}{Molar\,mass\,of\,one\,mole}\]

Complete answer:
KCl is potassium chloride which is a metal halide salt, it comprises potassium and chloride. It is crystalline and is white or colorless. It is water-soluble and tastes like salt. It is a naturally occurring mineral.
$2KCl{{O}_{3}}\to 2KCl+3{{O}_{2}}$
Moles of ${{O}_{2}}$= $\dfrac{1.5}{32}$
                     = 4.68$\times {{10}^{-2}}$mol
From the balanced equation,
3 moles of ${{O}_{2}}$= 2 moles of KCl
4.68$\times {{10}^{-2}}$mol ${{O}_{2}}$ = $\dfrac{2\times 4.68\times {{10}^{-2}}}{3}$= $3.12\times {{10}^{-2}}$mol
Mass of KCl = moles $\times $molar mass
                      = 2.332 g
It has multiple correct options-

Option (C) 0.0313 mol and (D) 2.332 g are correct.

Note:
Uses of KCl are :
In fertilizer – Potassium chloride helps to make fertilizers i.e potash. There are two kinds of potash: Potassium chloride (Muriate of potash, MOP) and Potassium sulphate (Sulphate of potash, SOP).
In Medicine- KCl is used to treat low blood potassium as potassium is a very important element in the human body but it should be taken in a limit because an overdose of it can cause hyperkalemia and can stop the heart and a person can die. It is also used in lethal injections.
In Culinary- It is often mixed with NaCl because of its weak, bitter, unsalty flavor and it can be used as a salt substitute for food. To reduce the bitterness, one could add 1 ppm of thaumatin.
In Industries- For the production of potassium hydroxide and potassium metal.
Other applications include food processing, soaps, and scientific applications.