A clown needs 4.5 x 10^15 particles of Helium (He). How many grams of helium does he need?

How many FeO particles are there in 21g of FeO?

How many atoms are in 10.5 grams of Chlorine gas (Cl)?

How many atoms are in 12.2 grams of CO2?

How many atoms are in 1.2 grams of Ca?

What is the molar mass of CaO?

You discovered an unknown metal. It is either K, Co, or Cu. 1 mole of the metal is weighed at 58.93 grams. What is the metal?

How many grams are in 2.4 x 10^15 atoms of Helium (He)?

The mole is a...

What is the molar mass of Re?

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