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- 1. Multiple Choice
What is the gram formula mass of CaF2?
58 amu
58 g
78 amu
78 g
- 2. Multiple Choice
The mass of one mole of an element is equal to
its atomic number from the periodic table, but in amus.
its atomic mass from the periodic table, but in amus.
its atomic mass from the periodic table, but in grams.
its atomic number from the periodic table, but in grams.
- 3. Multiple Choice
How many formula units are in 2.5 moles of NaCl?
1.5 x1024 formula units
1.5 formula units
4.2 formula units
4.2 x10-24 molecules
- 4. Multiple Choice
Shivani measures out 6.0 moles of epsom salt (MgSO4) to put in her bath. How many grams of MgSO4 went in the bath?
3.6 x 1024 g
720 g
0.050 g
340 g
- 5. Multiple ChoiceHow many molecules are there in 31.8 moles of water?5.28 x 10-23 molecules1.91 x 1025 molecules5.28x 10-251.91 x 1022
- 6. Multiple Choice
Determine the mass of 4.20 moles of C6H12
353 g
0.0499 g
337 g
2.53 x 1024 g
- 7. Multiple Choice
What is the mass of 1.2 x 1024 atoms of C?
2.0 grams
24 grams
0.17 grams
1.4 x 1025 grams
- 8. Multiple Choice
Calculate the number of atoms in 0.0340 g Zn.
5.20 x 10-4 atoms Zn
3.13 x 1023 atoms Zn
3.13 x 1020 atoms Zn
2.05 x 1022 atoms Zn
- 9. Multiple ChoiceHow many formula units are there in 2.45 moles potassium chloride?4.07 x 10-241.47 x 10241.474.07
- 10. Multiple ChoiceWhat is the percent by mass of magnesium in MgO?20%40%50%60%
- 11. Multiple ChoiceWhich pair has the same empirical formula?NaCrO4 and Na2Cr2O7C2H4O2 and C6H12O6C3H6O3 and C2H6O2CH4 and C2H6
- 12. Multiple ChoiceWhat is the molecular formula if the empirical formula is CH2O and the molecular molar mass is 180.18?CH2OC2H4O2C4H8O4C6H12O6
- 13. Multiple ChoiceIn which compound is the percent composition by mass of Cl equal to 42%?HClO (gram formula mass = 52 g/mol)HClO2 (gram formula mass = 68 g/mol)HClO3 (gram formula mass = 84 g/mol)HClO4 (gram formula mass = 100 g/mol)
- 14. Multiple Choice
What is the empirical formula for N2S3?
NS
N3S2
N2S3
N1S1.5
- 15. Multiple ChoiceHow many oxygen atoms in
Mg(NO3)21236 - Answer choicesTagsAnswer choicesTags