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- 1. Multiple Choice
Which BEST describes what the unit of mole can be used for?
To measure the amount of grams in a substance
To measure the amount of atoms or molecules in a substance
To measure the amount of energy in a substance
To measure the amount of bonding in a substance
- 2. Multiple ChoiceWhat are the units for molar mass?
grams
amu
grams/mole
liters
- 3. Multiple ChoiceThe molar mass of an element is equal to its...
Atomic mass
Atomic number
Oxidation number
Valence electrons
- 4. Multiple Choice
Calculate the molar mass of AuCl3
96 g
130 g
232.5 g
303.3 g
- 5. Multiple Choice
Calculate the moles in 12.7g of CaF2
0.20 mol
1,000.76 mol
6.14 mol
0.16 mol
- 6. Multiple ChoiceWhat is the mass of 0.89 mol of CaCl2?
111 grams
0.008 grams
98.9 grams
none of the choices
- 7. Multiple Choice
How many grams are in 2.40 mol of sulfur?
9.35 x 10-3 g
77.0 g
616 g
0.0748 g
- 8. Multiple Choice
A mass of 6 g of Carbon contains
1 mole of C
2 moles of C
0.5 moles of C
- 9. Multiple ChoiceHow many moles of magnesium are in 3.01x1022 atoms of magnesium?5.00x1044 moles Mg0.050 moles Mg1.81x1046 moles Mg5 moles Mg
- 10. Multiple Choice
How many molecules are in 9.4 moles of ibuprofen?
5.665.66x10240.7051.25x1023 - 11. Multiple ChoiceA compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?Mg4N3MgN2Mg3N2MgN
- 12. Multiple ChoiceYou are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.SOSO2SO3SO4
- 13. Multiple Choice
How many molecules are in 2.5 mol of NaCl?
1.5 x 1024 molecules
1.5 molecules
4.15 molecules
1.5 x 1023 molecules
- 14. 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
- 15. Multiple ChoiceWhat is the percent by mass of sodium in NaCl?39%61%35%65%
- 16. Multiple ChoiceAn empirical formula:is a formula that calculates the coefficients of a compound in a balanced equation.is the simplest whole-number ratio of moles of elements in the compound.
- 17. Multiple ChoiceWhat is the empirical formula of the following molecular formula: C3H6C3H6CH2C2H4CH3
- 18. Multiple Choice
Molecular Formula = C2F6
Choose the correct empirical formula.
CF
C2F6
C3F
CF3
- 19. Multiple Choice
The empirical formula of a substance is CH2O. The molar mass is 180g/mol. What is the molecular formula?
CH2O
C3H6O3
C6H12O6
C12H6O12
- 20. 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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