1. What is the maximum mass of iron that can be obtained by the
reaction of 65.25 g Fe2O3 and 25.96 g of
H2?
Fe2O3(s) + 3H2(g)
-> 2 Fe(s) + 3H2O(g)
2. What is the percentage yield for a reaction in which 2.50g of
AgCl is obtained from 1.50g of strontium chlorida and a slight
excess of silver nitrate?
SrCl2(aq) + 2AgNO3(aq) ->
2AgCl(s) + Sr(NO3)2 (aq)
3. Determine the oxidation numbers for each chemical species.
identify the reduced...
what is the maximum mass (in grams) of each of the following
soluble salts that can be added to 160 mL of 0.050 M
BaCl2 without causing precipitate to form? (assume the
addition of solid causes no change in volume).
a. (NH4)2SO4
b. Pb(NO3)2
c. NaF
Styrofoam has a density of 32kg/m^3. What is the maximum mass
that can hang without sinking from a 70-cm diameter Styrofoam
sphere in water? Assume the volume of the mass is negligible
compared to that of the sphere. Express your answer to two
significant figures and include the appropriate units.
At -13.5C (a common temperature for household freezers), what is
the maximum mass of sucralose (C12H19Cl3O8) you can add to 3.00 kg
of pure water and still have the solution freeze? Assume that
sucralose is a molecular solid and does not ionize when it
dissolves in water. Kf values are:
Constants for freezing-point depression and boiling-point
elevation calculations at 1 atm:
Solvent
Formula
Kf value*
(°C/m)
Normal freezing
point (°C)
Kb value
(°C/m)
Normal boiling
point
(°C)
water
H2O
1.86...
At –12.5 °C (a common temperature for household freezers), what
is the maximum mass of saccharin (C7H5NO3S) you can add to 1.00 kg
of pure water and still have the solution freeze? Assume that
saccharin is a molecular solid and does not ionize when it
dissolves in water. Kf values are given here.
Solvent
Formula
Kf
value*
(°C/m)
Normal freezing
point (°C)
Kb
value
(°C/m)
Normal boiling
point
(°C)
water
H2O
1.86
0.00
0.512
100.00
benzene
C6H6
5.12
5.49
2.53...
The storage battery of a car has an emf of 12 Volt. If the internal resistance of the battery is 0.4 Ω, what is the maximum current that can be drawn from the battery?