Name:____________________________________________
One Step Stoichiometry Problems
Section I. Calculate the number of moles for each of these samples by dividing their sample
mass by their molar mass. #1 is done for you.
#1. How many moles are there in 24g of Carbon?
24g C
1
1mol C
12g C
2 mol Carbon
#2. How many moles are there in 36g of Sodium Chloride?
#3 How many moles are there in 203g of Tricarbon dioxide?
#4. How many moles are there in 2g of Vanadium (III) Oxide?
Section II. Calculate the mass for each of these samples by multiplying their # of moles by
their molar mass. #5 is done for you.
#5 What is the mass of 2.3mol of water?
2.3 mol H2O
1
18g H2O
1 mol H2O
#6. What is the mass of 3.4mol of Iron (III) Chloride?
41g H2O
Name:____________________________________________
#7. What is the mass of 0.5mol of Potassium permanganate?
#8. What is the mass of 200mol of Hydrogen gas?
Section III. Calculate the # of particles for each of these samples by taking the # of moles and
multiplying by Avogadro’s number (6.02x1023) #9 is done for you.
#9. How many particles are there in 4.6mol of Copper (II) Chloride?
4.6mol CuCl2
6.02 ×
10 𝑝𝑎𝑟𝑡𝑖𝑐𝑙𝑒𝑠 𝑜𝑓 𝐶𝑢𝐶𝑙2
1 𝑚𝑜𝑙 𝐶𝑢𝐶𝑙2
23
1
2.77 × 1023 𝑝𝑎𝑟𝑡𝑖𝑙𝑐𝑒𝑠 𝑜𝑓 𝐶𝑢𝐶𝑙2
#10. How many particles are there in 3.54mol of Sodium bicarbonate?
#11. How many particles are there in 25mol of H2O?
#12. How many particles are there in 12mol of Bromine gas?
Section IV. Calculate the # of moles for each of these samples by taking your # of moles and
dividing by Avogadro’s number (6.02x1023) #13 is done for you.
#13. How many moles are there in 6.04x1025 particles of dicarbon hexafluoride?
6.04x1025particles C2F6
1
1mol C2F6
6.02x1023particles of C2F6
100.3mol C2F6
Name:____________________________________________
#14. How many moles are there in 2.37x1027particles of water?
#15. How many moles are there in 2.9x1011particles of ammonium hydroxide?
#16. How many moles are there in 3.4x10203particles of magnesium oxide?
Section V. Calculate the number of moles for each of these samples by dividing the sample
volume by the gas volume constant at STP (22.4L) #17 is done for you
#17. How many moles are there in 35L of water vapor at STP?
35L H2O
1
1mol H2O
22.4L H2O
1.56mol H2O
#18. How many moles are there in 250L of carbon dioxide gas at STP?
#19. How many moles are there in 0.03L of hydrogen gas at STP?
#20. How many moles are there in 2,030L of carbon hexafluoride gas at STP?
Section VI. Calculate the volume for each of these gases at STP by multiplying the number of
moles by the gas volume constant at STP (22.4L) #21 is done for you.
#21. What is the volume of 4moles of water vapor at STP?
4mol H2O
1
22.4L H2O
1mol H2O
89.6L H2O
Name:____________________________________________
#22. What is the volume of 34moles of bromine gas at STP?
#23. What is the volume 2.5moles of dinitrogen monophosphide gas at STP?
#24. What is the volume of 200moles of water vapor at STP?
Section VII. Convert from moles of one substance to another by multiplying by the mole ratio
of the two compounds/element(s) in question. #25 is done for you.
Use this balance reaction for #25-#28
2Fe(OH)3 + 3MgCl2  2FeCl3 + 3Mg(OH)2
#25. How many moles of magnesium chloride will react with 1.5moles of Iron(III) hydroxide?
1.5mol Fe(OH)3
1
3mol MgCl2
2mol Fe(OH)3
2.25mol MgCl2
#26. How many moles of iron (III) chloride will be produced if 2 moles of iron(III) hydroxide fully react?
#27. How many moles of iron (III) hydroxide are needed to produce 3.2moles of iron (III) chloride?
#28. How many moles of magnesium chloride are needed to react if 3.2moles of magnesium
hydroxide is produced?