How many moles of lead (II) chloride will be formed from a reaction between

How Many Moles Of Lead Ii Chloride Will Be Formed Chemistry QuestionHow Many Moles Of Lead Ii Chloride Will Be Formed Chemistry Question

How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g of HCl?

Options

(a) 0.044
(b) 0.333
(c) 0.011
(d) 0.029

Correct Answer:

0.029

Explanation:

PbO + 2Hcl → PbCl₂ + H₂O
At. wt of PbO= 207+16=223g
At. wt of 2HCl= 2 x 36.5=73g
At. wt of PbCl₂= 207+71=278g
223 g of PbO reacts with 73 g of HCl to form 278 g of PbCl₂
When 3.2g HCl reacts with 6.5 g PbO,
amount of PbO that reacts with 3.2 HCl = (223/73) x 3.2 = 9.77 g
Since amount of PbO present is only 6.5 g, it acts as limiting reagent.
Amount of PbCl₂ formed by 6.5 g of PbO = (278/223) x 6.5g
Number of moles of PbCl₂ formed = (278/223) x (6.5/278) moles = 0.029 moles

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