Mole Conversions Practice

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Round molar masses to the nearest whole number when doing calculations. You will need a periodic table. Give your answers as numbers, not words.
1. What is the mass of 4 moles of helium, He?

grams



2. How many moles of carbon dioxide, CO2, are in a 22 gram sample of the compound?

moles



3. How many moles of carbon tetrafluoride, CF4, are in 176 grams of CF4?

moles



4. What is the mass of 0.5 moles of carbon tetrafluoride, CF4?

grams



5. A chemist needs 3 moles of aluminum oxide, Al2O3 for a particular experiment. How many grams of Al2O3 should she weigh out?

grams



6. How many moles of water are in 360 grams of water?

moles



7. What is the mass of 2.5 moles of hydrogen fluoride gas, HF?

grams



8. How many moles of chromium metal, Cr, are in a 260 gram piece of chromium?

moles



9. What is the mass of 5 moles of nitrogen gas, N2?

grams



10. How many moles of ammonia, NH3, are in 51 grams of NH3?

moles



11. What is the mass of 3 moles of carbon disulfide, CS2?

grams



12. 1000 gram of calcium is _______ moles of calcium, Ca.

moles