Answer: I think it’s C
Explanation:
I went to bird school where I learned about this stuff. I’m a little rusty, but I still do good.
Democritus because of Greek atomism. In the 5th century BCE, Leucippus and his pupil Democritus proposed that all matter was composed of small indivisible particles called atoms.
Total change in energy = Heat produced by system + work done on the system
= 228 - 55
= 173 kJ
Because this energy is released as heat, the reaction is exothermic.
Answer:
pH of the solution = 9.45
Explanation:
pKb = 8.57
pKb = -logKb
Kb = antilog pkb
ICE table for the ionization of pyrodine is:
initial 0.435 0 0
equi. 0.435 - x x x
so,
![k_b =\frac{ [C_5H_5NH^+][OH^-]}{[C_5H_5N]}\\1.78\times 10^{-9}=\frac{x^2}{0.453 - x}](https://tex.z-dn.net/?f=k_b%20%3D%5Cfrac%7B%20%5BC_5H_5NH%5E%2B%5D%5BOH%5E-%5D%7D%7B%5BC_5H_5N%5D%7D%5C%5C1.78%5Ctimes%2010%5E%7B-9%7D%3D%5Cfrac%7Bx%5E2%7D%7B0.453%20-%20x%7D)
As kb is very less that means there is very less ionization, hence x can be ignored as compared to 0.435
pOH = -log[OH-]
![pOH = -log[2.78\times 10^{-5}]\\=4.55](https://tex.z-dn.net/?f=pOH%20%3D%20-log%5B2.78%5Ctimes%2010%5E%7B-5%7D%5D%5C%5C%3D4.55)
pH = 14 - pOH
= 14 - 4.55
= 9.45
Answer:
1.72 L
Explanation:
Initial Temperature of the gas T =90°+273= 363 K
Initial Volume of the gas V1= 1.41 L
Final temperature of the gas T2= 170°c +273= 443 K
Final volume of the gas V2= ????
Using Charles law;
V1/T1 = V2/T2
V1T2= V2T1
V2= V1T2/T1
V2= 1.41×443/363
V2= 1.72 L
