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25 questions
The relative molecular mass of calcium hydroxide is
40.1
57.1
74.1
91.1
An oxide of sulfur contains equal percentages by mass of sulfur and oxygen. The formula of the oxide is
SO
SO2
SO3
SO4
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
What is the mass of aluminium contained in 204 g of aluminium oxide?
27 g
54 g
108 g
150 g
102 g
One mole of hydrogen and one mole of ammonia have the same
mass in grams
number of molecules
number of atoms
relative molecular mass
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
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
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
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.
What is the molar mass of PbSO4?
303.27 g/mol
255.27 g/mol
163.87 g/mol
372.27 g/mol
How many formula units are in 2.5 moles of NaCl?
1.5 x1024
1.50
4.20
4.2 x10-24
15.05
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
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
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
What is the percent composition by mass of sulfur (S) in the compound MgSO4?
20.22%
19.85%
26.64%
28.64%
What is the percent composition by mass of magnesium in the compound MgSO4
20%
27%
46%
53%
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
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
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
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
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
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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