Question

200 gms of marble chips are dropped into 100 g of hydrochloric acid. How much chips will remain undissolved? What weight of anhydrous calcium chloride and what weight of $C{{O}_{2}}$ gas could be obtained from it?
$CaC{{O}_{3}}\to CaO+C{{O}_{2}}$

Answer 1

The quantitative study of the reactants and products involved in a chemical reaction is known as Stoichiometry, which is concerned with numbers. This concept helps to balance the chemical reactions to calculate the number of reactants and products. Generally, all the reactions depend on the substance required for the reaction.

Complete step by step solution:
The number of molecules that participate in a reaction is called a stoichiometric number, which represents a number before atoms or molecules or ions in a reaction. This number may be a fraction or number.
According to the mole concept, to represent atoms or molecules are in bulk by Avogadro’s number, which is one mole of a substance containing $6.023X{{10}^{23}}$ molecules.
Molar mass is called the mass of one mole of a substance in grams. This molar mass is numerically equal to the atomic/molecular mass.
For example, given number of moles of calcium carbonate = $\dfrac{Weight\text{ }of\text{ }marble\text{ }chips/CaC{{O}_{3}}}{Molar\text{ }mass\text{ }ofCaC{{O}_{3}}}=\dfrac{200g}{100g/mole}=2mole$
Moles of HCl = $\dfrac{100}{36.5}=2.74moles$
Given reaction,
$CaC{{O}_{3}}\to CaO+C{{O}_{2}}$
From the reaction, 0.63moles of calcium carbonate means 63g remains undissolved
1.37 moles of anhydrous calcium chloride is formed,
Then, the weight of anhydrous calcium chloride = $111X1.37=150.67grams$
Similarly, 1.37moles of carbon dioxide formed,
Then, the weight of $C{{O}_{2}}$ = $44X1.37=60.28grams$

The weight of anhydrous calcium chloride and weight of $C{{O}_{2}}$ gas could be obtained from the given reaction are 152.07g and 60.28g respectively.

Note: With the help of stoichiometry, can determine how much substance for concern reaction is needed or present. Reactants and product mass, molecular weight, chemical equations, and formulas able to measure by stoichiometry concept. in a given useful equation, the desired amount of products will produce from the amount of materials determined by stoichiometry concept in industry method.