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Bohr's Model of a Hydrogen Atom

how many mole...

Question

how many moles are there in 49.0g of potassium dichromate, K2Cr2O7 ? (atomic masses: K = 39, Cr = 52, O = 16 )

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Solution

Mass of potassium dichromate (K₂Cr₂O₇ ) = 49 g
Molar mass of K₂Cr₂O₇ = 2 $\times$ 39 + 2 $\times$ 52 + 7 $\times$ 16 = 294 g mol^-1
Number of moles (n) = $\frac{Mass}{Molar mass}$
n = $\frac{49}{294}$ = 0.166 moles

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