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- 1. Multiple ChoiceHow many molecules are in 2.5 mol of NaCl?1.51x10231464.151.51x1024
- 2. Multiple ChoiceHow many molecules of sugar (C6H12O6) are in a mole?24 molecules180 molecules180 g6.02 x 1023 molecules
- 3. Multiple ChoiceHow many grams are in 1.2 x 1024 molecules of CO?28 grams56 grams6.02 grams1.2 grams
- 4. Multiple ChoiceHow many steps are in a gram to mole conversion?1234
- 5. Multiple ChoiceWhat is the molar mass of table salt (NaCl)?116.886 g/mol35.453 g/mol22.990 g/mol58.443 g/mol
- 6. Multiple ChoiceWhat are the units for molar mass?gramsamugrams/moleliters
- 7. Multiple Choice
(0901) Avogadro’s number is:
6.02 x 1022
6
6.02 x 1023
3.01 x 1023
- 8. Multiple Choice
(0902) Which compound has the smallest molar mass?
CO
CO2
H2O
H2O2
- 9. Multiple Choice
(0903) How many moles are in 16.94 g of water? (hint: do you know the formula for water?)
16.94 moles
0.9403 mole
305.2 moles
1.063 moles
- 10. Multiple ChoiceWhich conversion factor should be used for the following question " How many molecules are there in 4.00 moles of glucose, C6H12O6?1 mole = 78.12 g1 mole = 22.4 L1 mol = 6.02x 1023 particlesmore than one
- 11. Multiple ChoiceWhich conversion factor should be used to solve the following, "How many moles of argon atoms are present in 11.2 L of argon gas at STP?"1 mol = 22.4 L1 mol = 39.95 g1 mol = 6.02x1023 atomsMore than 1
- 12. Multiple ChoiceWhich expression below show the correct method of determining the percent composition of Sodium in Na2CO3?%Na = (22.99g/106g) x 100%Na = (22.99g/106) / 100%Na = (45.98g/106g) x 100%Na = (106/45.98g) x 100
- 13. Multiple ChoiceFind the percent composition of hydrogen in (NH4)2S.11.8%41.1%47.1%
- 14. Multiple Choice
If you burned 6.1 x 1024 molecules of ethane, C2H6, what mass of ethane did you burn?
10.1 grams
304 grams
1.8 grams
none of the choices
- 15. Multiple Choice
A container with a volume of 893 L contains how many moles of air at STP?
20003.2 L
39.9 L
22.4 L
none of the choices
- 16. Multiple Choice
A chemical reaction produces 0.37 mol of N2 gas. What volume will that gas occupy at STP?
0.02 L
10.4 L
5.2 L
8.3 L
- 17. Multiple ChoiceWhat is the percent by mass of oxygen in MgO?20%40%50%60%
- 18. Multiple ChoiceWhich pair has the same empirical formula?NaCrO4 and Na2Cr2O7C2H4O2 and C6H12O6C3H6O3 and C2H6O2CH4 and C2H6
- 19. Multiple ChoiceA compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?Mg4N3MgN2Mg3N2MgN
- 20. Multiple ChoiceA formula with the lowest whole # ratio of elements in a compound is calledMolecular FormulaChemical FormulaEmpirical FormulaDistance Formula
- 21. Multiple ChoiceWhat is the molecular formula if the empirical formula is CH2O and the molecular molar mass is 180.18?CH2OC2H4O2C4H8O4C6H12O6
- 22. Multiple ChoiceWhat is the molecular formula for a compound with the empirical formula: K2SO4 and a molecular mass of 696g.K2SO4K8SO16K8S4O8K8S4O16
- 23. 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
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