What is the Henry's law constant for CO2 at 20∘C?
Express your answer to three significant figures and include the
appropriate units.
What pressure is required to achieve a CO2 concentration of
9.40×10−2 M at 20∘C?
Express your answer to three significant figures and include the
appropriate units.
At 1 atm, how many moles of CO2 are released by raising the
temperature of 1 liter of water from 20∘C to 25∘C?
Express your answer to four decimal places and include...
Enter your answer in the provided box. The solubility of N2 in
blood at 37° C and at a partial pressure of 0.80 atm is 5.6 × 10−4
mol/L. A deep-sea diver breathes compressed air with the partial
pressure of N2 equal to 3.8 atm. Assume that the total volume of
blood in the body is 4.8 L. Calculate the amount of N2 gas released
(in liters at 37° C and 1.00 atm) when the diver returns to the
surface...
The Henry's Law constant for CO2 is 3.4 x 10-2 M/atm
at 25°C. What pressure of carbon dioxide is needed to maintain a
CO2 concentration of 0.10 M in a can of soda?
Enter your answer in the provided box. A 58.92−g sample of water
at 74.9°C is added to a sample of water at 25.3°C in a
constant-pressure calorimeter. If the final temperature of the
combined water is 42.8°C and the heat capacity of the calorimeter
is 26.3 J/°C, calculate the mass of the water originally in the
calorimeter.
Enter your answer in the provided box. What is the emf of a cell
consisting of a Pb2+ / Pb half-cell and a Pt / H+ / H2 half-cell if
[Pb2+] = 0.96 M, [H+] = 0.017 M and PH2 = 1.0 atm ?
Enter your answer in the provided box.
A sample of zinc metal is allowed to react completely with an
excess of hydrochloric acid:
Zn(s) + 2 HCl(aq) → ZnCl2(aq) + H2(g)
The hydrogen gas produced is collected over water at 25.0°C.
The volume of the gas is 8.45 L, and the atmospheric pressure is
0.951 atm. Calculate the amount of zinc metal in grams consumed in
the reaction.
(Vapor pressure of water at 25°C = 23.8 mmHg.)
ANSWER ____ g...
Enter your answer in the provided box. A 1.70−g sample of water
is injected into an evacuated 4.50−L flask at 40.0° C. What
percentage of water will be vapor when the system reaches
equilibrium? Assume ideal behavior of water vapor and that the
volume of liquid water is negligible. The vapor pressure of water
at 40.0° C is 55.3 mmHg. An answer should be in percent.
Enter your answer in the provided box.
Determine the pH of
(a) a 0.15 M NH3 solution.
(b) a solution that is 0.15 M NH3 and 0.40 M NH4Cl.
Kb for NH3 is 1.8 × 10−5
Enter your answer in the provided box in scientific notation. A
hydrogen-like ion is an ion containing only one electron. The
energy of the electron in a hydrogen-like ion is given by
En = −(2.18 × 10−18J) Z2 (1/n2)
where n is the principal quantum number and Z is the atomic
number of the element.
Plasma is a state of matter consisting of positive gaseous ions
and electrons. In the plasma state, a mercury atom could be
stripped of its...