chemistry multiple choice

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A student weighed 22.17g of a rare compound of osmium (IV) oxide Os02, to use in a reaction. How many moles of Oso2 is this?

a: .15

b: 4.2 x 10^-1

c: 9.9 x 10^-2

d: 6.5 x 10^-2

e: .013

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