Moles, Molecules, and Grams Worksheet Answer Key

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3 Moles, Molecules, and Grams Worksheet Answer Key 1) How many are there in 24 grams of FeF 3? 1.28 x ) How many are there in 450 grams of Na 2 SO 4? 1.91 x ) How many grams are there in 2.3 x atoms of silver? 421 grams 4) How many grams are there in 7.4 x of AgNO 3? 209 grams 5) How many grams are there in 7.5 x of H 2 SO 4? 122 grams 6) How many are there in 122 grams of Cu(NO 3 ) 2? 3.92 x ) How many grams are there in 9.4 x of H 2? 312 grams 8) How many are there in 230 grams of CoCl 2? 1.07 x ) How many are there in 2.3 grams of NH 4 SO 2? 1.69 x ) How many grams are there in 3.3 x of N 2 I 6? 430 grams 11) How many are there in 200 grams of CCl 4? 7.82 x ) How many grams are there in 1 x of BCl 3? 195 grams 13) How many grams are there in 4.5 x of Ba(NO 2 ) 2? 17.1 grams 14) How many are there in 9.34 grams of LiCl? 1.33 x ) How many grams do 4.3 x of UF 6 weigh? 2.51 grams 16) How many are there in 230 grams of NH 4 OH? 3.96 x Cavalcade Publishing All Rights Reserved For chemistry help, visit

4 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 2000 Cavalcade Publishing All Rights Reserved For chemistry help, visit

5 Worksheet Mole Conversions Name: I. Practice Problems A. What is the mass of 1 mole (molar mass) of: Answers in g/mole 1. H Mg(OH) CO NH 4 Cl CuSO AgNO B. Convert from grams to moles, or moles to grams 1. How many moles is 12.5 g of magnesium hydroxide?.214 moles 2. How many moles is 1.46 g of hydrogen gas (H 2 )?.724 moles 3. How many grams are in 4.3 moles of ammonium chloride? 230 grams C. Convert from moles to, or to moles 1. How many are in 2.0 moles of hydrogen gas (H 2 )? x How many moles is 2.0 x of silver nitrate? 33.2 moles D. How many atoms of oxygen are in 2.4 x of copper(ii) sulfate? 9.6 x10 23 atoms of oxygen II. Application Problems A. How many are in 96 g of carbon dioxide? 1.31x10 24 B. How many oxygen atoms are in 96 g of CO 2? x10 24 atoms C. How many grams would 1.0 x of copper(ii) sulfate weigh? 2650 grams D. How much does each individual molecule of copper(ii) sulfate weigh? amu s

6 Mole Calculation Worksheet 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 2000 Cavalcade Publishing All Rights Reserved For chemistry help, visit

7 Grams/Moles Calculations Answer Key Given the following, find the number of moles: 1) 30 grams of H 3 PO moles 2) 25 grams of HF 1.25 moles 3) 110 grams of NaHCO moles 4) 1.1 grams of FeCl moles 5) 987 grams of Ra(OH) moles 6) 564 grams of copper 0.11 moles 7) 12.3 grams of CO moles 8) 89 grams of Pb(CH 3 COO) moles Given the following, find the number of grams: 9) 4 moles of Cu(CN) grams 10) 5.6 moles of C 6 H grams 11) 21.3 moles of BaCO grams 12) 1.2 moles of (NH 4 ) 3 PO grams 13) 9.3 x 10-3 moles of SmO 1.5 grams 14) 6.6 moles of ZnO grams 15) 5.4 moles of K 2 SO grams 16) 88.4 moles of NI grams 2000 Cavalcade Publishing All Rights Reserved For chemistry help, visit

8 Mass and Moles Worksheet - Answers 1. How many moles in 34.2 g of sulfur? 1.07 mol S 2. How many grams in 1.20 moles of carbon? 14.4g C 3. How many atoms in 3.91 moles of sodium? 2.35 x atoms Na 4. How many atoms in moles of strontium? 2.72 x atoms Sr 5. How many in 31 g of chlorine gas? 2.6 x Cl 2 6. How many nitrogen atoms in 3.4 moles of ammonia? 2.0 x atoms N 7. What mass would 4.52 x of water have? 135g H 2 O 8. How many oxygen atoms in 2.3 x 10-8 g of oxygen? 8.7 x atoms O 9. How may atoms in 1.00 ounce of pure gold? 8.65 x atoms Au 10. How many sugar (C 12 H 22 O 11 ) could you make from 1.0 pound of carbon? 1.9 x C 12 H 22 O What is the mass of 4.00 moles of sugar? 1370g sugar 12. How many moles of sulfate ions would be released if 2.5 moles of aluminum sulfate were dissolved in water? 7.5 mol SO What is the mass of 1.2 x 10-3 moles of sodium chloride? 0.070g NaCl 14. How many formula units of NaCl are there in 3.55 x 10-6 g of salt? 3.65 x formula units NaCl 15. How many Volkswagons are there in 2 moles of Volkswagons? 1 x VW s

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11 Percentage Composition Worksheet Give the % composition of all elements in these compounds. Show all work! 1) ammonium sulfite (NH 4 ) 2 SO 3 % N % H % S 2) aluminum acetate Al(C 2 H 3 O 2 ) 3 % Al % C % H 3) sodium bromide NaBr % Na % Br 4) copper (II) hydroxide Cu(OH) 2 % Cu % H 5) magnesium carbonate MgCO 3 % Mg % C

12 6) iron (II) phosphate Fe 3 (PO 4 ) 2 % Fe % P 7) beryllium nitride Be 3 N 2 % Be % N 8) potassium cyanide KCN % K % C % N 9) manganese (III) nitrate Mn(NO 3 ) 3 % Mn % N 10) lithium phosphide Li 3 P % Li % P 11) nickel (III) sulfate Ni 2 (SO 4 ) 3 % Ni % S

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