Answer:
The value of Henry's law constant for N2 = 6.26 * 10^-4 M/ atm
Explanation:
Step 1: Data given
Temperature = 25.0 °C
The N2 component will dissolve in water with a solubility of 4.88*10^−4 M
air is at standard pressure = 1.00 atm
Step 2: Calculate Henry's law constant for N2
C=k*Pgas
⇒ with C = the solubility of a gas at a fixed temperature in a particular solvent
⇒ with k = Henry's law constant
⇒ with Pgas = the partial pressure of the gas
k = C/Pgas
Since 78.0 % of the gas is N2
P(N2) = 0.78 atm
k = C/P(N2) = (4.88*10^−4 M)/(0.78 atm)
k = 6.26 * 10^-4 M/ atm
The value of Henry's law constant for N2 = 6.26 * 10^-4 M/ atm
Answer: True
Explanation:
Let's begin by explaining that the vision phenomenon depends on three elements: the observer, the object and the light source.
In addition, objects have pigments, which generally absorb more light than they reflect (they absorb certain wavelengths and reflect others). Therefore, the color that a given object seems to have depends on which parts of the visible electromagnetic spectrum are reflected and which parts are absorbed.
In this sense, the colours we see are in fact the wavelengths that are reflected or transmitted from the object. For example, a red object has that color because when it is illuminated whith white light, the pigments on this object abrsorb all the the wavelengths of the visible electromagnetic spectrum, except red. That is why red light is the only light that is reflected from the mentioned object.
Answer;
-Not that reactive
The element found is not very reactive.
Explanation;
-If an element is found in nature in its pure elemental state then the the element found is not very reactive.
-There are many elements which are not much reactive. such as in metals- Ag, Au, Hg, Cu etc. and in Non metals- O2, N2, Inert gases etc.
-
For checking its chemical properties you will have to examine it with O2 or C-12.
Answer:
I cannot give you all the answer but I can help you to solve those.
Explanation:
The first question:
How many grams are there in 7.5×
molecules of 
?
So we need to find the molecular mass first, use your periodic table,
And then we can find out 2+32+16×4=98 g/mol
Then, we need to find how many moles, by using Avogadro's constant:
Avogadro's constant: 1 mole = 6.02×
∴
=1.25 mol(2d.p.)
Lastly, find the grams using the formula 
m=Mn
m=1.25*98
m=122.5g
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In conclusion, use those formula to help you:
(which M = molecular mass(atomic mass) m=mass of the substance and n = moles)
Avogadro's constant: 
The net iconic charge of an oxygen ion is -2
