Molar Mass Worksheet Answer Key

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1 Molar Mass Worksheet Answer Key Calculate the molar masses of the following chemicals: 1) Cl 2 71 g/mol 2) KOH 56.1 g/mol 3) BeCl 2 80 g/mol 4) FeCl g/mol 5) BF g/mol 6) CCl 2 F g/mol 7) Mg(OH) g/mol 8) UF g/mol 9) SO g/mol 10) H 3 PO 4 98 g/mol 11) (NH 4 ) 2 SO g/mol 12) CH 3 COOH 60 g/mol 13) Pb(NO 3 ) g/mol 14) Ga 2 (SO 3 ) g/mol

2 Avogadro s Number and the Mole 1) How many moles of water does 6.02 x molecules represent? 2) Convert 3.01 x molecules of C 2 H 6 to moles 3) How many moles of glucose does 1.2 x molecules represent? 4) How many moles of CaCl 2 does 2.41 x formula units represent 5) How many atoms does 2.0 moles of He represent? 6) How many sodium ions are in 3.0 moles of NaCl? 7) How many molecules are in 0.25 moles of CH 4? 8) How many total atoms are in 1.0 moles of H 2 O?

3 Mass and the Mole Answer Key 1) How many moles are in 15 grams of lithium? 0.46 moles 2) How many grams are in 2.4 moles of sulfur? 77.0 grams 3) How many moles are in 22 grams of argon? 0.55 moles 4) How many grams are in 88.1 moles of magnesium? 2141 grams 5) How many moles are in 2.3 grams of phosphorus? moles 6) How many grams are in 11.9 moles of chromium? grams 7) How many moles are in 9.8 grams of calcium? 0.24 moles 8) How many grams are in 238 moles of arsenic? 17,826 grams What are the molecular weights of the following compounds? 9) NaOH 40.1 grams 12) H 3 PO grams 10) H 2 O 18.0 grams 13) Mn 2 Se grams 11) MgCl grams 14) (NH 4 ) 2 SO grams 15) How many grams are in 4.5 moles of sodium fluoride, NaF? 189 grams 16) How many moles are in 98.3 grams of aluminum hydroxide, Al(OH) 3? 1.26 moles 17) How many grams are in 0.02 moles of beryllium iodide, BeI 2? 5.2 grams 18) How many moles are in 68 grams of copper (II) hydroxide, Cu(OH) 2? 0.70 moles 19) How many grams are in 3.3 moles of potassium sulfide, K 2 S? grams 20) How many moles are in 1.2 x 10 3 grams of ammonia, NH 3? 70.6 moles 21) How many grams are in 2.3 x 10-4 moles of calcium phosphate, Ca 3 (PO 3 ) 2? grams 22) How many moles are in 3.4 x 10-7 grams of silicon dioxide, SiO 2? 5.66 x 10-9 moles 23) How many grams are in 1.11 moles of manganese sulfate, Mn 3 (SO 4 ) 7? grams

4 Combined Mole Calculations Answer Key 1) How many molecules are there in 24 grams of FeF 3? 1.28 x molecules 2) How many molecules are there in 450 grams of Na 2 SO 4? 1.91 x molecules 3) How many grams are there in 2.3 x atoms of silver? 421 grams 4) How many grams are there in 7.4 x molecules of AgNO 3? 209 grams 5) How many grams are there in 7.5 x molecules of H 2 SO 4? 122 grams 6) How many molecules are there in 122 grams of Cu(NO 3 ) 2? 3.92 x molecules 7) How many grams are there in 9.4 x molecules of H 2? 312 grams 8) How many molecules are there in 230 grams of CoCl 2? 1.07 x molecules 9) How many molecules are there in 2.3 grams of NH 4 SO 2? 1.69 x molecules 10) How many grams are there in 3.3 x molecules of N 2 I 6? 430 grams 11) How many molecules are there in 200 grams of CCl 4? 7.82 x molecules 12) How many grams are there in 1 x molecules of BCl 3? 195 grams 13) How many grams are there in 4.5 x molecules of Ba(NO 2 ) 2? 17.1 grams 14) How many molecules are there in 9.34 grams of LiCl? 1.33 x molecules 15) How many grams do 4.3 x molecules of UF 6 weigh? 2.51 grams 16) How many molecules are there in 230 grams of NH 4 OH? 3.96 x molecules

5 More Combined Mole Calculations- Solutions 1. Calculate the mass of mole of CaCl g/mol 2. Calculate grams in moles of CO g 3. Calculate number of moles in 32.0 g of CH mol 4. Determine mass in grams of 40.0 moles of Na 2 CO g 5. Calculate moles in g of HgS 0.722mol 6. Calculate moles in g of Al 2 S mol 7. How many moles are in g of H 2 O 1.50mol 8. Determine the mass in grams of Avogadro number of C 12 H 22 O g/mol 9. Find mass in grams of 9.03 moles of H 2 S 308g 10. Determine grams in mole of NH g Consider the molecule CuNH 4 Cl 3 as you answer Name the elements present. Copper, Nitrogen, Hydrogne, Chlorine 12. How many atoms form the molecule? Nine 13. How many of each atom in the molecule? Cu-1, N-1, H-4, Cl How many hydrogen atoms in one mole of molecules? 2.41 x atoms 15. How many chlorine atoms in six moles of molecules? x atoms 16. What is the molar mass of this molecule? g/mol 17. What is the mass in grams of one molecule? x g 18. How many moles would be in 6.84 g of this substance? mol 19. You need mole of lead (II) chromate. How much should you weigh on the scale? 3.23g 20. Given 6.40 g of HBr. How many moles is this? mol Write the correct formula for calcium acetate and then answer based on it. 21. What is the mass of exactly one mole of calcium acetate? Ca(C 2 H 3 O 2 ) 2 158g/mol 22. How many moles are contained in 1.58 g of the substance in #23? 0.01mol 23. How much does mole of #23 weigh? 63.3g 24. Write the formula for oxygen gas. O How many atoms (and moles) are represented by the formula in #24? 2 atoms, 1/N A mole of molecules 26. What is the mass of Avogadro Number of oxygen molecules? g/mol

6 The Mole Review (Solutions) 1) Define mole x of anything, usually atoms or molecules. 2) How many moles are present in 34 grams of Cu(OH) 2? 0.35 moles 3) How many moles are present in 2.45 x molecules of CH 4? 0.41 moles 4) How many grams are there in 3.4 x molecules of NH 3? 96 grams 5) How much does 4.2 moles of Ca(NO 3 ) 2 weigh? 689 grams 6) What is the molar mass of MgO? 40.3 grams/mole 7) How are the terms molar mass and atomic mass different from one another? Molar mass is used to describe the mass of one mole of a chemical compound, while atomic mass is used to describe the mass of one mole of an element or the mass of one atom of an element. 8) Which is a better unit for expressing molar mass, amu or grams/mole? Grams/mole is better, because any macroscopic amount of a substance is better expressed in grams than amu.

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