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- 1. Multiple Choice
The relative molecular mass of calcium hydroxide is
40.1
57.1
74.1
91.1
- 2. Multiple Choice
An oxide of sulfur contains equal percentages by mass of sulfur and oxygen. The formula of the oxide is
SO
SO2
SO3
SO4
- 3. Multiple Choice
Element X forms an acid with the formula H3XO4. The relative molecular mass of acid is 98.0. What is the relative atomic mass of X?
81.0
34.0
33.0
31.0
12.25
- 4. Multiple Choice
What is the mass of aluminium contained in 204 g of aluminium oxide?
27 g
54 g
108 g
150 g
102 g
- 5. Multiple Choice
One mole of hydrogen and one mole of ammonia have the same
mass in grams
number of molecules
number of atoms
relative molecular mass
- 6. Multiple Choice
The number of molecules in 1 mole of a gas is z. What is the number of oxygen molecules in 8 g of oxygen gas?
8z
z
0.5z
0.25z
- 7. Multiple Choice
How many molecules are there in 6 dm3 of carbon dioxide (measured at s.t.p.)?
1.61 x 1023
6.02 x 1023
12.04 x 1023
2.41 x 1024
2.25 x 1024
- 8. Multiple Choice
How many atoms are contained in 32 g of methane, CH4?
6.02 x 1023
1.20 x 1024
2.40 x 1024
6.02 x 1024
- 9. Multiple Choice
Which amount contains the largest mass?
1 mole of water molecules
0.25 mole of magnesium oxide
10 moles of hydrogen atoms
6 dm3 of sulfur dioxide gas at r.r.p.
- 10. Multiple Choice
What is the molar mass of PbSO4?
303.27 g/mol
255.27 g/mol
163.87 g/mol
372.27 g/mol
- 11. Multiple Choice
How many formula units are in 2.5 moles of NaCl?
1.5 x1024
1.50
4.20
4.2 x10-24
15.05
- 12. 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
- 13. Multiple Choice
Calculate the number of atoms in 0.0340 g Zn.
5.23 x 10-4 atoms Zn
3.15 x 1023 atoms Zn
3.15 x 1020 atoms Zn
2.05 x 1022 atoms Zn
- 14. Multiple Choice
How many moles are in 98.3 grams of aluminum hydroxide, Al(OH)3?
1.26 moles
0.8 moles
7,670 moles
1.63 x 10-22 moles
- 15. Multiple Choice
What is the percent composition by mass of sulfur (S) in the compound MgSO4?
20.22%
19.85%
26.64%
28.64%
- 16. Multiple ChoiceWhich pair has the same empirical formula?NaCrO4 and Na2Cr2O7C2H4O2 and C6H12O6C3H6O3 and C2H6O2CH4 and C2H6
- 17. Multiple ChoiceWhat are the units for molar mass?gramsamugrams/moleliters
- 18. Multiple Choice
What is the percent composition by mass of magnesium in the compound MgSO4
20%
27%
46%
53%
- 19. Multiple ChoiceWhat is the empirical formula for the following molecular formula: C6H14C6H14C3H7CH2CH3
- 20. Multiple Choice
A compound with the following composition has a molar mass of 60.10g/mol: 39.97% carbon; 13.41% hydrogen; 46.62% nitrogen. Find the molecular formula.
C2H3N2
CH2N
CH4N
C2H8N2
- 21. Multiple Choice
What is the molarity of 4 grams of sodium chloride (NaCl) in 3,800 ml of solution?
0.018 M
0.018 m
1.052 M
1.052 m
- 22. Multiple Choice
How many moles of NaCl are present in 125 ml of the solution with a molarity of 8.59M? (M = concentration = mole/dm3)
1.074 mol
62.7 mol
1.07 mol
62.7 grams
- 23. Multiple Choice
How many grams of solute are dissolved in 125.0 ml of 5 mole/dm3 NaCl?
0.625 g NaCl
36.52 g NaCl
36.5 g NaCl
0.625 mol NaCl
- 24. Multiple Choice
Find the concentration of 186.55 g of sugar (C12H22O11) in 250 ml of water.
2,18 mol/l
2,17 mol/l
1,18 mol/l
0,00218 mol/l
0,217 mol/l
- 25. Multiple Choice
How many moles of solute are contained in 3.0 l of a 1.5 mole per litre solution?
4.5 moles
1.5 moles
2.0 moles
0.5 moles
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