6.4 The Mole: Conversions to Atoms and Molecules

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How many formula units are in 24.0 grams of FeF3?

1.281×10^23 formula units

A block of lead weighs 11.3 grams. How many atoms of lead are in this sample?

3.28×1022 atoms

A 430 g sample of N2I6 would contain how many molecules?

3.3×10^23 molecules

A sample of sulfur trioxide (SO3) weighs 5100 g. How many molecules are contained in this sample? Use 80.063gmol for the molar mass of SO3.

3.8 x10^2

What is the mass in grams of 1.00×106 sodium atoms?

3.818×10^−17 g

What is the average mass in grams of one uranium atom (U)?

3.953x10^-22 g

Calculate the number of atoms in 37.1 grams of LiBr.

5.15×10^23

A sample of lithium has a mass of 0.0624 grams. How many atoms are present in this sample?

5.41×10^21 atoms


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