Answer:
36 KJ of heat are released when 1.0 mole of HBr is formed.
Explanation:
<em>By Hess law,</em>
<em>The heat of any reaction ΔH for a specific reaction is equal to the sum of the heats of reaction for any set of reactions which in sum are equivalent to the overall reaction:</em>
H 2 (g) + Br 2 (g) → 2HBr (g) ΔH = -72 KJ
This is the energy released when 2 moles of HBr is formed from one mole each of H2 and Br2.
Therefore, Heat released for the formation of 1 mol HBr would be half of this.
Hence,
ΔHreq = -36 kJ
36 KJ of heat are released when 1.0 mole of HBr is formed.
Answer:
a) Solubility diminishes.
b) Solubility remains constant.
c) Solubility increases.
d) Solubility increases.
Explanation:
Hello,
a) In this case, we've got to take into account that the solubility of a gas into a liquid increases as the pressure does it (because the molecules are forced to gather with the liquid's particles) and the other way around, in such a way, as the pressure is decreased, the solubility is decreased as well.
b) Well, the outer space is related with the atmospheric pressure as long as the column of air is what is exerting the pressure, thus, as this pressure is quantified as 1 atm, there won't be any appreciable change in the solubility as the pressure remains the same.
c) Now, as the pressure is increased, the solubility is increased in a very similar way that in the a) part.
d) Submerging the solution 40m underwater means that the fluid's column above the solution is increased, thus, the pressure is increased, so the solubility is increased as well.
Best regards.
Answer:
2
b= they are grouped differently, but all the atoms are still there.
Answer:
pH 12
Explanation:
Hydrogen ion concentration is usually expressed in terms of pH, which is the logarithm of the reciprocal of the hydrogen ion concentration. The molar concentration of dissolved hydrogen ions in solution is a measure of acidity. The greater the concentration of hydrogen ions in solution, the greater its acidity. This concentration can range over a tremendous range, from 10^-1 M to 10^-14 M. A convenient system of expressing this range of concentrations is the pH scale which means power of hydrogen.
The higher the pH value the lesser the hydrogen ion concentration and the greater the hydroxide ion concentration. A pH value of 1-6 indicates acidity (high hydrogen ion concentration) a pH of 7 indicates neutrality while a pH of 8-12 indicates alkalinity (high hydroxide ion concentration).
