How many moles are in 550.0 g of lead(II) sulfate?

1 Answer
Stefan V.
Mar 6, 2017

"1.814 moles PbSO"_4

Explanation:

You can go from moles of a given substance to grams or vice versa by using the molar mass of said substance.

The molar mass tells you the mass of 1 mole of a given substance

"molar mass" = "mass in grams"/"1 mole of substance"

In your case, lead(II) sulfate, "PbSO"_4, has a molar mass of "303.2626 g mol"^(-1), which means that every mole of lead(II) sulfate has a mass of "303.2626 g".

To convert from grams to moles, set up the molar mass as a conversion factor with the mass of 1 mole as the denominator

"1 mole PbSO"_4/"303.2626 g"

You will have

550.0 color(red)(cancel(color(black)("g"))) * "1 mole PbSO"_4/(303.2626color(red)(cancel(color(black)("g")))) = color(darkgreen)(ul(color(black)("1.814 moles PbSO"_4)))

The answer is rounded to four sig figs.

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