1. Question:
A total of 1.4 moles of sodium
nitrate is dissolved in enough
water to make 2.0 liters of an
aqueous solution. What is the
gram formula mass of sodium
nitrate?
10. Question:
A total of 1.4 moles of sodium
nitrate is dissolved in enough
water to make 2.0 liters of an
aqueous solution. The gram
formula mass is 85 g/m.
Determine the molarity of the
solution.
9. Question:
A 2.0 liter aqueous solution
contains a total of 3.0 moles of
dissolved NH4Cl at 25C and
standard pressure. Determine
the molarity of the solution.
Answer:
2.1 moles
Answer:
85 g/mol
Answer:
0.7 M
2. Question:
A total of 1.4 moles of sodium
nitrate is dissolved in enough
water to make 2.0 liters of an Answer:
aqueous solution. The gram 1.5 M
formula mass is 85 g/m. What
mass of the solute is used to
make the solution?
8. Question:
A tablet of one antacid
contains citric acid, H3C6H5O7,
and sodium hydrogen
carbonate, NaHCO3. This
reaction is represented by the
equation:
Answer:
119 g
Determine the total number
of moles of sodium hydrogen
carbonate that will completely
react with 0.010 mole of citric
acid.
11. Question:
What is the gram-formula
mass of citric acid, H3C6H5O7
3. Question:
A 240000-gram sample of an
aqueous solution contains
0.012 grams of NH3. What is
the concentration of NH3 in
the solution, expressed in parts
per million?
7. Question:
A 5000 gram sample of an
aqueous solution contains
0.001 grams of a solute. What
is the concentration of the
solution expressed in parts per
million?
Answer:
0.03 mol
Answer:
192 g/mol
Answer:
5.0 ppm
12. Question:
What is the gram formula
mass of MgSO4?
Answer:
0.2 ppm
18. Question:
What is the percent
composition by mass of sulfur
in the compound MgSO4?
(Gram formula mass = 120 g
per mole)
Answer:
120 g/mol
4. Question:
What is the gram formula
mass of NH4OH?
Answer:
27%
15. Question:
What is the percent
composition by mass of
nitrogen in NH4OH? (Gram
formula mass = 35
grams/mole)
17. Question:
Hydrogen peroxide, H2O2, is a
water-soluble compound. The
concentration of an aqueous
hydrogen peroxide solution is
3% by mass. Calculate the
total mass of H2O2 in 20
grams of an aqueous H2O2
solution that is used as an
antiseptic.
13. Question:
What is the gram formula
mass of H2O2?
Answer:
35
grams/mole
Answer:
40%
Answer:
0.6 grams
5. Question:
The reaction between
aluminum and copper (II)
sulfate is represented by the
equation below.
Determine the total mass of
Cu produced when 1.08 grams
of Al reacts completely with
9.58 grams of CuSO4 to
produce 6.85 grams of
Al2(SO4)3.
16. Question:
Given the balanced equation
representing a reaction:
What is the mass of H2O
produced when 10.0 grams of
H2 reacts complete with 80 g
of O2?
Answer:
34 grams
per mole
Answer:
3.81 grams
14. Question:
A solution of HCl is 2 Molar.
Answer:
How many moles of HCl are in 90 grams
1 L of this solution?
6. Question:
3 L of a 0.7 Molar solution of
NaCl (aq) has how many
moles of NaCl?
Answer:
2 moles