1. If You Have 30.0G of Gold How Many Moles Do You Have?

Mole challenge: 1. If you have 30.0g of gold how many moles do you have? 0.152 mol Au 2. If you have 10 balloons containing 1.2L (at STP) of helium gas each, how many atoms of helium gas do you have? 3.2 X 1023 atoms 3. How many atoms of calcium would be in 67.89g Ca? 1.02 X 1024 atoms 4. What is the mass of 9.2 moles of nitrogen? 130 g 5. How many molecules of carbon monoxide are emitted from a radiator each hour if you know that 5.4 liters (at STP) is emitted each hour? 1.5 X 1023 molecules 6. How many grams of nitrogen gas are needed to fill an air bag to a volume of 3.4L (at STP)? 4.2 g (note: nitrogen is in 7+1 club, so nitrogen gas is N2) 7. You mass out two teaspoons of baking soda (sodium hydrogen carbonate or sodium bicarbonate) for some cupcakes. If two teaspoons have a mass of 8.45g how many formula unites of baking soda do you have? 6.06 X 1022 formula units (a formula unit is like a molecule; it is the term for an ionic compound.) 8. If you have 4.5 x 1025 formula unite of table salt (NaCl), how many grams do you have? 4.4X103 g 9. How many moles of strontium chloride are in 78.74g of strontium chloride? 0.4996 mol 10. How many molecules of hydrogen gas would be in 4.37g of hydrogen gas? 23 1.30 X 10 molecules H2 11. If you have 10 helium balloons each containing 6.0g of He, how many atoms of He do you have? 9.0 X 1024 atoms 12. How many molecules of ammonia gas (NH3) would be in 27.25 moles of ammonia? 1.64 X 1025 molecules 13. How many formula units of TiO2 would be in 3.75kg? 2.83 X 1025 formula units 14. How many water molecules would be in 35.61g of water? 1.19 X 1024 molecules 15. How many liters of carbon dioxide (at STP) would be present if you had 3.49 moles of carbon dioxide? 78.2 L 16. How many molecules of carbon dioxide would be present in a sample that was 23.2L (at STP)? 6.23 X 1023 molecules 17. How many grams of calcium carbonate are present in a 4.47 mole sample of calcium carbonate? 447 g 18. How many formula units of zinc oxide are present in 105.0g of the compound? 7.77 X 1023 formula units 19. How many chocolate chip cookies do you have if you have one mole of chocolate chip cookies? 6.02 X 1023 cookies 20. If you have 22.4L of chlorine gas (at STP) how many moles of the gas do you have? 1 mole 21. What is the mass in grams of 6.0 moles of propane (C 3 H8)? 260 g 22. If the gas tank in your grill holds 4.87L of propane (C 3 H8) how many molecules would there be in a full tank of propane (at STP)? 1.31 X 1023 molecules 27 23. what would the mass of 5.87 x 10 formula units of CaCl2bc? 1.07 X 106 g 24. how many molecules of water would be found in 348.0g of water? 1.16 X 1025 molecules