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- 1. Fill in the Blank
A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula? (No spaces)
- 2. Multiple Choice
How many atoms of Na make up 5.17 moles of Na?
3.1 x 1024 atoms
6.02 x 1024 atoms
1.2 x 1024 atoms
2.4 x 1024 atoms
- 3. Multiple Choice
Find the percentage composition of P in Mg3(PO4)2.
27.74% P
23.57% P
43.62% P
12.63% P
- 4. Multiple ChoiceHow many moles are in 3.01 x 1022 atoms of magnesium?0.05 moles1.81 x 1046 moles5.00 x 1021 moles5 moles
- 5. Multiple ChoiceWhich pair has the same empirical formula?NaCrO4 and Na2Cr2O7C2H4O2 and C6H12O6C3H6O3 and C2H6O2CH4 and C2H6
- 6. Multiple ChoiceWhich one is an empirical formula?H2O2C2H6O12CaCl2N2O8
- 7. Multiple ChoiceWhat is the molecular formula for a compound with the empirical formula: K2SO4 and a molecular mass of 696g.K2SO4K8SO16K8S4O8K8S4O16
- 8. Multiple Choice
Which of the following have the same empirical formula? (Check all that apply)
C6H12O6
C4H8O4
C3H9O3
C4H10O2
- 9. Multiple Choice
Which of the following are the empirical formula for this formula: Si2F6
SiF
Si2F6
SiF3
Si6F2
- 10. Multiple Choice
What is the empirical formula of the compound shown in the image?
CH2OC2H4O2C4H8O4C6H12O6 - 11. Multiple Choice
If a student has 1258.73g of AlCl3, how many moles and particles does the student have of the sample of AlCl3?
5.68x1024 mol & 5.68 molec AlCl3
9.44 mol & 5.68x1024 molec AlCl3
1.25x1023 molec mol & 0.705 molec AlCl3
6.44 mol & 1.25x1023 molec AlCl3
- 12. Multiple Choice
Compared to 84g of carbon monoxide (CO), 84g of ethylene (C2H4) would contain which of the following?
The same number of atoms
The same number of molecules
Fewer atoms
More molecules
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