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- 1. Multiple ChoiceA compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?Mg4N3MgN2Mg3N2MgN
- 2. Multiple ChoiceYou are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.SOSO2SO3SO4
- 3. Multiple ChoiceGiven the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.NaPO2Na2PO3Na3PO4NaPO4
- 4. Multiple ChoiceWhat is the molecular formula for a compound with the empirical formula: K2SO4 and a molecular mass of 696g.K2SO4K8SO16K8S4O8K8S4O16
- 5. Multiple ChoiceWhat is the percent by mass of sodium in NaCl?39%61%35%65%
- 6. Multiple ChoiceA formula with the lowest whole # ratio of elements in a compound is calledMolecular FormulaChemical FormulaEmpirical FormulaDistance Formula
- 7. Multiple Choice
Si2F6
Choose the correct empirical formula...
SiF
Si2F6
SiF3
Si6F2
- 8. Multiple Choice
What is the empirical formula for N2S3?
NS
N3S2
N2S3
N1S1.5
- 9. Multiple Choice
C2F6
Choose the correct empirical formula...
CF
C2F6
C6F2
CF3
- 10. Multiple ChoiceA chemical formula that shows the actual # and kinds of atoms present in one molecule of a compound is called_________ionic formulacovalent formulaempirical formulamolecular formula
- 11. Multiple Choice
What is the best definition for subscript?
The big number that tells you the number of molecules.The atomic numberThe little number that tells the number of atoms for each element. - 12. Multiple Choice
How many "C" are in CO2
2
1
0
3
- 13. Multiple Choice
How many Carbons "C" are in C18H34O3
18
34
3
37
- 14. Multiple ChoiceWhich pair has the same empirical formula?NaCrO4 and Na2Cr2O7C2H4O2 and C6H12O6C3H6O3 and C2H6O2CH4 and C2H6
- 15. Multiple ChoiceWhat is the molecular formula if the empirical formula is CH2O and the molecular molar mass is 180.18?CH2OC2H4O2C4H8O4C6H12O6
- 16. Multiple ChoiceWhat is the percent by mass of oxygen in MgO?20%40%50%60%
- 17. Multiple ChoiceWhich one is an empirical formula?H2O2C2H6O12CaCl2N2O8
- 18. Multiple Choice
Which of these is NOT an empirical formula?
CH2
C2H5
C6H4
C3H7
C5H17
- 19. Multiple Choice
Which of the following could be a molecular formula with the empirical formula of CH2O?
CH2O2
CHO
C3H5O3
C2H4O2
- 20. Multiple Choice
What is the empirical formula of K2SO4?
K2SO4
KSO2
K2SO2
KSO8
- 21. Multiple ChoiceWhat is the molecular formula if the empirical formula is C2H5 and the molecular molar mass is 58.14 g/mol?C2H5C4H10C1H2.5C4H8
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