Answer:
pH = 0.81
Explanation:
HCl reacts with aniline, thus:
C₆H₅NH₂ + HCl → C₆H₅NH₃⁺ + Cl⁻
Moles of HCl are:
0.085L × (0.35mol HCl / L) = <em>0.02975mol HCl</em>
Moles of aniline are:
0.030L × (0.40mol HCl / L) = <em>0.012mol aniline</em>
Thus, after reaction, will remain:
0.02975mol - 0.012mol = <em>0.01775mol HCl</em>
Moles of HCl in solution are equal to moles of H⁺, thus, moles of H⁺ are: <em>0.01775mol H⁺</em>
As total volume is 85.0mL + 30.0mL = 115.0mL ≡ <em>0.115L</em>
0.01775mol / 0.115L = 0.1543M
pH of solution = -log[H⁺]
pH = -log 0.1543M
<em>pH = 0.81</em>
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Answer: The given question is incomplete. The complete question is:
At a certain temperature the rate of this reaction is second order in 
with a rate constant of 
. 
Suppose a vessel contains at a concentration of 0.100 M Calculate how long it takes for the concentration of to decrease to 0.0240 M. You may assume no other reaction is important. Round your answer to 2 significant digits.
Answer: It takes 0.93 seconds for the concentration to decrease to 0.0240 M.
Explanation:
Integrated rate law for second order kinetics is given by:
= initial concentration = 0.100 M
a= concentration left after time t = 0.0240 M
k = rate constant =
t = time taken for decomposition = ?
Thus it takes 0.93 seconds for the concentration to decrease to 0.0240 M.
To convert temperature in terms of kelvin to celsius, we subtract 273 to the given temperature in kelvin. In this problem, the given is 49 kelvin, thus, 49 - 273 is equal to -224 degrees celsius. The asnswer is <span>-224 degrees celsius. Kelvin is the SI unit for temperature.</span>
Of the three sources listed, geothermal energy
is the least dependent on the weather.
(Once it's installed and running, that is.)
Answer:
When potassium reacts with arsenic to form an ionic compound, each metal atom loses 1 electron(s) and each nonmetal atom gains 3 electron(s). There must be 3 potassium atom(s) for every 1 arsenic atom(s) in the reaction.
Explanation:
We need to consider the octet rule: each atom will gain or lose electrons to have 8 electrons in its valence shell.
- Potassium is in Group 1, so it has 1 valence electron, which will lose to form K⁺.
- Arsenic is in Group 15, so it has 5 valence electrons. Then, it will gain 3 electrons to form As³⁻.
To have an electrical molecule between K⁺ and As³⁻, we require 3 K⁺ and 1 As³⁻, and the resulting formula is K₃As.
