SATHEE: Some Basic Concepts Of Chemistry Question 126

Some Basic Concepts Of Chemistry Question 126

Question: Calcium carbonate reacts with aqueous HCl to give $C a C l_{2}$ and $C O_{2}$ according to the reaction,

$C a C O_{3} (s) + 2 H C l (a q) \to$ $C a C l_{2} (a q) + C O_{2} (g) + H_{2} O (l)$ In this reaction, 250 mL of 0.76 M HCI reacts with 1000 g of $C a C O_{3} .$ Calculate the mass of $C a C l_{2}$ formed in the reaction.

Options:

A) 11.1 g

B) 10.54 g

C) 5.25 g

D) 2.45 L

Show Answer

Answer:

Correct Answer: B

Solution:

[b] Molar mass of $C a C O_{3} = 40 + 12 + 3 \times 16 = 100 g m o l^{- 1}$ Moles of $C a C O_{3}$ in 1000 g. $n_{C a C O_{3}} = \frac{Mass(g)}{M o l a r, m a s s}$

$n_{C a C O_{3}} = \frac{1000}{100 g, m o l^{- 1}} = 10, m o l$

$molarity= \frac{M o l e s, o f, solute(HCl) \times 100}{V o l u m e, o f, s o l u t i o n}$

$0.76 = \frac{n_{H C l} \times 1000}{250}$

$n_{H C l} = \frac{0.76 \times 250}{1000} 0.19, m o l$

$\underset{1 m o l}{C a C O_{3} (s)} + \underset{2, m o l}{2 H C l (a q)}, \to C a C l_{2} (a q) +$ $C O_{2} (g) + H_{2} O (l)$ According to the equation, 1 mole of $C a C O_{3}$ reacts with 2 moles of HCl

$∴$ 10 moles of $C a C O_{3}$ will react with $\frac{10 \times 2}{1} = 20$ moles of HCI. But we have only 0.19 moles HCl, so HCl is the limiting reagent and it limits the yield of $C a C l_{2}$ . 0.19 moles of HCl will produce $\frac{1 \times 0.19}{2} = 0.095, m o l, C a C l_{2} .$ Molar mass of $C a C l_{2} = 40 + (2 \times, 35.5) = 111, g, m o l^{-}$

$∴$ 0.095 mole of
$C a C l_{2} = 0.095 \times 111 = 10.54, g$

Some Basic Concepts Of Chemistry Question 126

Question: Calcium carbonate reacts with aqueous HCl to give $C a C l_{2}$ and $C O_{2}$ according to the reaction,

Options:

Answer:

Solution:

Engineering Preparation

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Some Basic Concepts Of Chemistry Question 126

Question: Calcium carbonate reacts with aqueous HCl to give CaCl2 and CO2 according to the reaction,

Options:

Answer:

Solution:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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Question: Calcium carbonate reacts with aqueous HCl to give $C a C l_{2}$ and $C O_{2}$ according to the reaction,