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yuradex [85]
3 years ago
7

What is the mass of lead in 452 g PbCl2?

Chemistry
1 answer:
oksano4ka [1.4K]3 years ago
4 0

335.664 grams is the mass of lead in 452 grams of PbCl2.

Explanation:

Data given:

mass of lead in PbCl2 = 452 grams

mass of lead =?

atomic mass of PbCl2 = 278.1 grams/mole

atomic mass of Pb = 207.2 grams/mole

atomic mass of chlorine = 35.45 grams/mole

From the chemical formula of PbCl2 it is deduced that 1 mole of lead chloride contains 1 mole of Pb cation and 2 moles of chloride anion

number of moles of PbCl2 provided are:

number of moles = \frac{mass}{atomic mass}

number of moles = 1.62 moles of PbCl2 is provided

so when 1 mole of PbCl2 contains 1 mole of lead

then 1.62 moles of PbCl2 will have 1.62 moles of lead

mass = atomic mass x number of moles

mass of lead = 1.62 x 207.2

mass of lead = 335.664 grams

335.664 grams of lead is present in a sample of lead chloride having mass of 452 grams.

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Answer:

The answer to your question is: kc = 6.48

Explanation:

Data

             Given                 Molecular weight

CaO =    44.6 g                    56 g

CO₂ =     26 g                       44 g

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Find moles

        CaO                 56 g ----------------  1 mol

                                 44.6 g --------------   x

                               x = (44.6 x 1) / 56 = 0.8 mol

        CO₂                 44 g -----------------  1 mol

                                26 g ----------------    x

                               x = (26 x 1 ) / 44 = 0.6  moles

        CaCO₃            100 g ---------------   1 mol

                                42.3g --------------    x

                              x = (42.3 x 1) / 100 = 0.423 moles

       

Concentrations

 

        CaO     =    0.8 / 6.5  = 0.12 M

         CO₂    =     0.6 / 6.5 = 0.09 M

        CaCO₃  =   0.423 / 6.5 = 0.07 M

Equilibrium constant =   \frac{[products]}{[reactants]}

Kc = [0.07] / [[0.12][0.09]

Kc = 0.07 / 0.0108

kc = 6.48

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