Mole practice worksheet with answers

CONVERSION CALCULATIONS Complete the following. You MUST show all of your work in the conversions: 1) 540 Megabytes of ram = _______________Gigabytes of ram 2) 18fg = ___________Mg 3) 36 pencils = __________ dozen 4) 5 pencils = ___________ dozen 5) 6.02 X 1023 pencils = __________ moles 6) 12.0408 X 1023 pencils = __________ moles 7) 41.0 g N = _______________ moles 8) 41.0 g N = _______________ atoms 9) The mass of 1 atom of nitrogen 10) 2.408 X 1024 ammonia molecules = __________ moles 11) The # of nitrogen atoms in #10: 12) The # of hydrogen atoms in #10: 13) The # of TOTAL atoms in #10: 14) 0.86 moles of ammonia = ______________molecules Textbook practice: p. 99-101 and p. 104    Mole  Practice  Worksheet  #1     1.  What  is  the  atomic  mass  of…   a)  rubidium         b)  astatine         c)  manganese       2.  What  is  the  molar  mass  of…   a)  gallium  manganate     b)  triiodine  heptafluoride     c)  zinc  carbonate       3.  How  many  moles  are  there  in…   a)  86  g  of  chlorine  gas             b)  258  g  of  tellurium  dioxide  gas       c)  48.00  g  of  carbon  tetrafluoride  gas       4.  What  is  the  mass  in  grams  of…   a)  8  moles  of  ammonia     b)  5.0  moles  of  nitric  acid             c)  0.049  moles  of  hydrogen  chloride       5.  How  many  molecules/atoms  are  there  in  …   a)  4.5  moles  of  neon  gas           b)  1.50  moles  of  nitrogen  dioxide  gas     c)  35.0  g  of  sulphur  difluoride  gas       6.  What  would  be  the  mass  in  grams  of…   a)  6.02  x  1025  atoms  of  osmium   b)  1.53  x  1022  molecules  of  silicon  tetrabromide   c)  1  molecule  of  water     Answers     1.  atomic  mass  means  the  mass  of  a  single  atom   a)  85.5  a.m.u.     b)  210  a.m.u.     c)  54.9  a.m.u.       2.  molar  mass  means  mass  of  1  mole  of  the  substance  in  grams   a)  378  g/mole  Ga(MnO3)3     b)  514  g/mole  I3F7     c)  125  g/mole  ZnCO3     3.    a)    ?  moles  =  (1  mole  /  71.0  g)  (86  g)  =  1.2  moles  Cl2  (2  sig.  figs.)        b)      1.62  moles  TeO2             c)  0.545  moles  CF4     4.    a)      ?  g  =  (17.0  g  /  mole)  (8  moles)  =  100  g  NH3  (1  sig.  fig.)             b)  320  g  HNO3       c)  1.8  g  HCl     5.    a)      ?  molecules  =  (6.02  x  1023  atoms  /  mole)  (4.5  moles)  =  2.7  x  1024  atoms  Ne   b)  9.03  x  1023  molecules  NO2     c)  3.01  x  1023  molecules  SF2       6.    a)      ?g  =  (190.2  g  /  mole)(1  mole  /  6.02  x  1023  atoms)(6.02  x  1025  atoms)  =  1.90  x  104  g     b)  8.84  g  SiBr4       Mole Calculations Worksheet #2 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26.   c)  2.99  x  10-­‐23  g  H2O   How many moles of Na are in 42 g of Na? How many moles of O are in 8.25 g of O? How much does 2.18 mol of Cu weigh? What is the mass of 0.28 mol of iron? How many atoms are in 7.2 mol of chlorine? How many atoms are in 36 g of bromine? How many moles are in 1.0 x 109 atoms? What is the mass of 1.20 x 1025 atoms of sulfur? How many moles of CO molecules are in 52 g of CO? How many moles of C2H6 are in 124 g? How many moles of CCl4 are there in 56 g? What is the mass of 2.50 mol of H2SO4? What is the mass of 0.25 mol of Fe2O3? How many molecules are there in 52 g of CO? How many formula units are in 22.4 g SnO2? How many molecules are in 116 g CCl4? What is the mass of 3.01 x 1023 formula units of Fe2O3? What is the mass of 1.2 x 1025 molecules of CO? How many O atoms are in 1.25 mol of SO2? How many moles of O atoms do you have when you have 1.20 x 1025 N2O5 molecules? How many formula units are in 5.33 mol of CuCl2? How many copper atoms are in 5.33 mol of CuCl2? How many moles of Cl atoms are in 5.33 mol of CuCl2? How many moles of CuCl2 contain 1.2 x 1023 atoms of Cl? How many O atoms are in 3.15 mol of SnO2? How many H atoms are in 17.5 g (NH4)2C2O4? Answers 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 1.8 mol Na 0.516 mol O 139 g Cu 16 g Fe 4.3 x 1024 Cl atoms 2.7 x 1023 Br atoms 1.7 x 10-15 mol 639 g S 1.9 mol 4.12 mol 0.36 mol 245 g 40. g 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 1.1 x 1024 molecules 8.95 x 1022 formula units 4.54 x 1023 molecules 79.9 g Fe2O3 5.6 x 102 g CO 1.51 x 1024 O atoms 99.7 mol O 3.21 x 1024 formula units 3.21 x 1024 Cu atoms 10.7 mol of Cl atoms 0.10 mol CuCl2 3.79 x 1024 O atoms 6.79 x 1023 H atoms