Answer:
The answer to your question is below
Explanation:
H₂SO₄ = sulphuric acid
KOH = potassium hydroxide
This is a neutralization reaction
H₂SO₄ + 2 KOH ⇒ K₂SO₄ + 2H₂O
2 ----------- K ----------- 2
1 ----------- S ---------- 1
4 ---------- H --------- 4
6 ------------ O ---------- 6
Answer:
119.5 J
Explanation:
First we <u>calculate the temperature difference</u>:
- ΔT = 100 °C - 50 °C = 50 °C
Then we can <u>calculate the heat released</u> by using the following formula:
Where q is the heat, Cp is the specific heat, ΔT is the temperature difference and m is the mass.
We <u>input the data</u>:
- q = 0.239 J/g°C * 50 °C * 10.0 g
Given :
pH of solution of mixture of lactic acid and lactate is 4.26 .
To Find : ![log( \dfrac{[ \text{Conc. of lactate}]}{[\text{Conc . of lactic acid }]}) = 0.4](https://tex.z-dn.net/?f=log%28%20%5Cdfrac%7B%5B%20%5Ctext%7BConc.%20of%20lactate%7D%5D%7D%7B%5B%5Ctext%7BConc%20.%20of%20lactic%20acid%20%7D%5D%7D%29%20%20%3D%200.4)
The ratio of the lactate concentration to the lactate .
Solution :
We know , pKa of lactic acid is :
pKa = 3.86 .
Now , the solution of lactic acid and lactate is a buffer solution .
So , pHof buffer acid is given by :
![pH=pKa+log(\dfrac{[Salt]}{[Acid]})](https://tex.z-dn.net/?f=pH%3DpKa%2Blog%28%5Cdfrac%7B%5BSalt%5D%7D%7B%5BAcid%5D%7D%29)
Putting all given values :
Taking anti log both the sides , we get :
![\dfrac{[ \text{Conc. of lactate}]}{[\text{Conc . of lactic acid }]} = 2.51](https://tex.z-dn.net/?f=%5Cdfrac%7B%5B%20%5Ctext%7BConc.%20of%20lactate%7D%5D%7D%7B%5B%5Ctext%7BConc%20.%20of%20lactic%20acid%20%7D%5D%7D%20%20%3D%202.51)
Therefore , the ratio of the lactate concentration to the lactate is 2.51 .
Hence , this is the required solution .
<h3>
Answer: D) all of the above</h3>
Explanation:
The lungs pump oxygen in and carbon dioxide out, which goes through the blood stream to help with the cell's energy needs.
Nutrients pass through the blood stream as well. The nutrients start with the digestive system (mouth, esophagus, stomach, small intestine) before going into the blood stream. The nutrients are building blocks to help make new cells when old ones die off.
When those cells die off, the body sheds them like dead skin, but internal dead cells are passed off as waste. This waste and other byproducts the body doesn't need passes through the blood stream as well.
In short, the blood stream is basically the highway to help get desired materials (eg: oxygen and nutrients) and get rid of waste (eg: carbon dioxide and other unwanted byproducts or dead cell material)
So that's why the answer includes A, B and C.
Answer : Average atomic weight of copper atoms will be
63.62 u.
Explanation : For calculating average atomic weight for any given atom we use this formula,
m = Σ
X % abundance
where, m - avg atomic mass of isotope.
and
- mass of isotope
on solving we get,
m = [63 u X (69/100)] + [65 u X (31/100)] = 63.62 u.
