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NEET CHEMISTRYMedium

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.

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