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NEET CHEMISTRYSome Basic Concepts of ChemistryMedium

Question

The moles of lead (II) chloride that will be formed from a reaction between 6.5 g6.5 \text{ g} of PbO\text{PbO} and 3.2 g3.2 \text{ g} of HCl\text{HCl} are:

A

0.044

B

0.333

C

0.011

D

0.029

Step-by-Step Solution

The balanced chemical equation for the reaction is: PbO+2HClPbCl2+H2O\text{PbO} + 2\text{HCl} \rightarrow \text{PbCl}_2 + \text{H}_2\text{O}

First, we calculate the number of moles of each reactant: Molar mass of PbO=207.2+16=223.2 g mol1\text{PbO} = 207.2 + 16 = 223.2 \text{ g mol}^{-1}. Number of moles of PbO=6.5 g223.2 g mol1=0.0291 mol\text{PbO} = \frac{6.5 \text{ g}}{223.2 \text{ g mol}^{-1}} = 0.0291 \text{ mol}.

Molar mass of HCl=1+35.5=36.5 g mol1\text{HCl} = 1 + 35.5 = 36.5 \text{ g mol}^{-1}. Number of moles of HCl=3.2 g36.5 g mol1=0.0876 mol\text{HCl} = \frac{3.2 \text{ g}}{36.5 \text{ g mol}^{-1}} = 0.0876 \text{ mol}.

From the stoichiometry of the balanced equation, 1 mole1 \text{ mole} of PbO\text{PbO} requires 2 moles2 \text{ moles} of HCl\text{HCl}. Therefore, 0.0291 moles0.0291 \text{ moles} of PbO\text{PbO} will require 0.0291×2=0.0582 moles0.0291 \times 2 = 0.0582 \text{ moles} of HCl\text{HCl}. Since 0.0876 moles0.0876 \text{ moles} of HCl\text{HCl} are available, HCl\text{HCl} is in excess, making PbO\text{PbO} the limiting reagent .

The amount of product formed is entirely dependent on the limiting reagent. Since 1 mole1 \text{ mole} of PbO\text{PbO} yields 1 mole1 \text{ mole} of PbCl2\text{PbCl}_2, 0.0291 moles0.0291 \text{ moles} of PbO\text{PbO} will produce 0.0291 moles0.0291 \text{ moles} (approximately 0.029 moles0.029 \text{ moles}) of PbCl2\text{PbCl}_2.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Some Basic Concepts of Chemistry. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYSome Basic Concepts of Chemistrychlorideformedreactionbetweentextpbo

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