Answer:
K = 2.96x10⁻¹⁰
Explanation:
Based on the initial reaction:
N2O4 ⇄ 2NO2; K = 1.5x10³
Using Hess's law, we can multiply this reaction changing K:
3 times this reaction:
3N2O4 ⇄ 6NO2; K = (1.5x10³)³ =3.375x10⁹
The inverse reaction has a K of:
6NO2 ⇄ 3N2O4 K = 1/3.375x10⁹;
<h3>K = 2.96x10⁻¹⁰</h3>
Answer:
5200 ppm
Explanation:
As per the definition, parts per million of a contaminant is a measure of the amount of mass of contaminant present per million amount of the solution. It is denoted by ppm.
Given in the question,
Water = 250 ml = 250 g
Lead = 1.30 g
So,
ppm of Lead = = = 5200 ppm
So, as calculated above, there is 5200 ppm of lead present in 250 ml of water.
<u>We are given:</u>
Mass of ice = 100 grams
Initial temperature = -50°C
Final Temperature = -10°C
We know that the specific heat of ice is 2.09 joules / (gram * °c)
<u>Heat Absorbed:</u>
We know that:
ΔQ = mcΔT [where ΔQ is the heat absorbed]
ΔQ = (100 grams)(2.09)(-10 - (-50))
ΔQ = (100)(2.09)(40)
ΔQ = 8360 Joules
I don't know if I am correct but I am just guessing, I think that it is the suspended mass. I don't know if that is correct.
Answer: Option (c) is the correct answer.
Explanation:
Generally, when we move from top to bottom in a group then there occur increase in the number of electrons due to which there will also occur increase in the number of shells.
As atomic size is the distance between the nucleus and valence shell of an atom. Hence, more is the number of shells present in an atom more will be its atomic radius.
Thus, we can conclude that the statement atomic radius of elements in a group decreases as you go from top to bottom, is generally FALSE.