Check your answer...do you agree? Great if you do. If you do not check the Solution: below the table to see how the mass of Cr2O3 is calculated.

Formula

M , Molar Mass

(g­mol-1)

mass of sample

(g)

n, number of

moles of sample

N, number of atoms,

molecules or formula units

Cr2O3

152

243

1.66

9.63 x 1023

Solution:

We are to calculate the mass of Cr2O3 in the sample. Since we know the moles of Cr2O3 in the sample and the molar mass of Cr2O3 the mass of the sample can be calculated,

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