For example, consider the energy used by an electric fan. The amount of electrical energy used is greater than the kinetic energy of the moving fan blades. Because energy is always conserved, some of the electrical energy flowing into the fan's motor is obviously changed into unusable or unwanted forms.
<span>0.032000000 cg
Rounding off ........>
0.0320 cg
The last zero means the measurement is accurate to that digit
</span>
The percentage of yield was 777.78%
<u>Explanation:</u>
We have the equation,
Be
[s] + 2
HCl
[aq] → BeCl
2(aq] +
H
2(g] ↑ Be
(s] +
2
HCl
[aq] → BeCl
2(aq] +
H
2(g]
↑
To find the percent yield we have the formula
Percentage of Yield= what you actually get/ what you should theoretically get x 100
=3.5 g/0.45 g 100
= 777.78 %
The percentage of yield was 777.78%
Titanic - it is the theme song by celine dion
chemicals made from oil is petrochemicals
Answer:
The pH at the midpoint in the titration of an acid with a base is
A) equal to the pK of the corresponding base.
B) equal to the pK of the corresponding acid.
C) equal to 14 minus the pK of the corresponding acid.
D) equal to 14 plus the pK of the corresponding base.
E) none of the above
Explanation:
When a weak acid is titrated with a strong base, then a buffer solution is formed.
pH of a buffer solution can be calculated by using the formula:
![pH=pKa+log\frac{[salt]}{[acid]}](https://tex.z-dn.net/?f=pH%3DpKa%2Blog%5Cfrac%7B%5Bsalt%5D%7D%7B%5Bacid%5D%7D)
Exactly at the mid point,
[conjugate base of the salt]=[acid]
So, log [salt]/[acid] =0
Hence, pH of the solution will be equal to pKa of the weak acid.
Answer is option B.
