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cryssatemp

The relation of this question can be written as follows:


X moles of Pb(SO4)2 = 156g of Pb(SO4)2

We already know the Molecular weight of Pb(SO4)2 is [tex]399.34 g/moles[/tex]

This can be found from the atomic mass of each element of the Periodic Table.

But, we need to make a change of units from g/moles to moles, and we can do it using the following formula:

[tex]moles of Pb(SO4)2=\frac{grams of Pb(SO4)2}{molecular weight of Pb(SO4)2}[/tex]


We have:

grams of Pb(SO4)2=156.5 g

molecular weight of Pb(SO4)2= 399.34 g/moles

Now we only have to substitute the values, being careful with the units:


[tex]moles of Pb(SO4)2=\frac{156.5 g}{399.34 g/moles}[/tex]

[tex]moles of Pb(SO4)2=0.3918 moles[/tex]

Finally :

0.3918 moles of Pb(SO4)2 are equivalent to 156.5 g of Pb(SO4)2



samueladesida43

0.392 moles of Pb(SO4)2 are equivalent to 156.5 g of Pb(SO4)2.

HOW TO CALCULATE NUMBER OF MOLES:

  • The number of moles of a substance can be calculated by dividing the mass of the substance by its molecular weight

That is;

  • no. of moles (mol) = mass (g) ÷ molecular weight (g/mol)

  • According to this question, 156.5 g of Pb(SO4)2. The molecular weight is given as 399.34 g/mol. The number of moles can be calculated as follows:

  • no. of moles = 156.5g ÷ 399.34g/mol

  • no. of moles = 0.392mol

  • Therefore, 0.392 moles of Pb(SO4)2 are equivalent to 156.5 g of Pb(SO4)2.

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