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- 1. Multiple ChoiceWhat is the percent by mass of magnesium in MgO?20%40%50%60%
- 2. Multiple ChoiceWhat is the percent by mass of sodium in NaCl?39%61%35%65%
- 3. Multiple ChoiceWhat is the percent by mass of chlorine in NaCl?39%61%35%65%
- 4. Multiple ChoiceWhat is the percent composition by mass of sulfur in the compound MgSO4 (gram formula mass = 120 g/mol)?20%27%46%53%
- 5. Multiple ChoiceWhat is the percent composition by mass of magnesium in the compound MgSO4 (gram formula mass = 120 g/mol)?20%27%46%53%
- 6. Multiple ChoiceWhat is the percent by mass of oxygen in MgO?20%40%50%60%
- 7. Multiple ChoiceWhat is the percent by mass of fluorine in CaF2 (gram-formula mass = 78 g/mol)?24%49%51%65%
- 8. Multiple ChoiceWhat is the percent by mass of calcium in CaF2 (gram-formula mass = 78 g/mol)?24%49%51%65%
- 9. Multiple ChoiceHow many molecules are there in 0.04 moles of CaF?2.4 x 10232.4 x 10222.361450
- 10. Multiple ChoiceWhat is the percent composition on Oxygen in NO2? (rounded)40%50%60%70%
- 11. Multiple ChoiceWhich of the following is NOT needed to calculate percent composition?Mass of specific elementMolar MassAvogadro's NumberDivision
- 12. Multiple ChoiceFind the percent composition of Cu in CuBr2 .28.45%32.85%17.78%68.10%
- 13. Multiple ChoiceWhat is the percent composition of S in the formula (NH4)2S ?12.05%19.30%47.11%56.18%
- 14. Multiple ChoiceYou are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements. (keep two decimal places throughout calculations)SOSO2SO3SO4
- 15. Multiple ChoiceWhat is the empirical formula if you have 88.80% copper and 11.20% oxygen?Cu3O8CuO4Cu2OCu4O10
- 16. Multiple ChoiceWhat is the empirical formula for the following molecular formula: C6H14C6H14C3H7CH2CH3
- 17. Multiple ChoiceWhat is the molecular formula if the empirical formula is C2H5 and the molecular molar mass is 58.14 g/mol?C2H5C4H10C1H2.5C4H8
- 18. Multiple ChoiceGlycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula for glycerol?C2H3O2CH2OC2H4O2C3H8O3
- 19. Multiple ChoiceWhat is the empirical formula for the following:
C3H8OC1.5H4O0.5C3H8OC6H16O2C3H2O - 20. Multiple ChoiceWhat is the empirical formula for the following:
Pb5Cr5O20Pb2Cr2O10PbCr2O7Pb9Cr4O2PbCrO4 - 21. Multiple ChoiceWhat is the percent composition of Benzene, C6H6?C = 50%
H = 50%C = 85.7 %
H = 14.3%C = 92.2%
H = 7.8%C = 71.9%
H = 28.1% - 22. Multiple ChoiceWhat is the percent composition of water?H = 11.1%
O = 89.9%H = 66.7%
O = 33.3%H = 5.6%
O = 89.9%H = 20%
O = 80% - 23. Multiple ChoiceAn 8 g sample of a compound is found to be 3.766 g Aluminum & 4.234 g Oxygen. What is it's empirical formula?Al2O3AlO2Al2OAl3O2
- 24. Multiple ChoiceWhat is the empirical formula of the following molecular formula: C3H6C3H6CH2C2H4CH3
- 25. Multiple ChoiceWhat is the molecular formula if the empirical formula is C2H5 and the molecular molar mass is 58.14 g/mol?C2H5C4H10C1H2.5C4H8
- 26. Multiple ChoiceWhat is the empirical formula for the following molecular formula: C6H14C6H14C3H7CH2CH3
- 27. Multiple ChoiceWhat is the molecular formula if the empirical formula is CH2O and the molecular molar mass is 180.18?CH2OC2H4O2C4H8O4C6H12O6
- 28. Multiple ChoiceWhat is the empirical formula for the following molecular formula: C5H12C5H12CH3CH2C2.5H6
- 29. Multiple ChoiceWhich pair has the same empirical formula?NaCrO4 and Na2Cr2O7C2H4O2 and C6H12O6C3H6O3 and C2H6O2CH4 and C2H6
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