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Answer :
To calculate the number of formula units in 159g of PbCrO₄, convert the mass to moles using the molar mass of PbCrO₄ and then use the 1:1 ratio to find the number of formula units.
To calculate the number of formula units in 159g of PbCrO₄, we need to convert the given mass to moles using the molar mass of PbCrO₄. The molar mass of PbCrO₄ can be calculated by adding the atomic masses of Pb, Cr, and O:
Molar mass of Pb = 207.2 g/mol
Molar mass of Cr = 52.0 g/mol
Molar mass of O = 16.0 g/mol
Therefore, molar mass of PbCrO₄ = (207.2 + 52.0 + (16.0 x 4)) g/mol = 323.2 g/mol
Now, we can use the molar mass to convert grams to moles:
Number of moles = 159g / 323.2 g/mol = 0.492 moles
Since there is a 1:1 ratio between the compound and its formula units, the number of formula units in 159g of PbCrO₄ is also 0.492.
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