What is the molality of a solution containing 125 grams of iodine (I2) and 750 grams of CCl4? A. 1.2 m. . B. 6.57 m. . C. 0.657 m. . D. 0.12 m.
Answers
The molality is the number of moles of solute divided by kilograms of solvent. In a solution, solute the component which is present in lesser amount while solvent is present in greater amount. Thus, I2 is solute, and CCl4 is solvent.
So, first we need to calculate moles of I2:
Atomic mass of iodine: A(I) = 126.9
Molecular mass of iodine: Mr(I2) = 2*A(I) = 2 * 126.9 = 253.8
This means there are 253.8 g of iodine in 1 mole. So, 125 g of iodine will be in how many moles?
253.8 : 1 = 125 : x ⇒ x = 125/253.8 = 0.493 moles
Now, let's convert amount of CCl4 in kilograms (1 kg = 1000 g):
750 g = 750/1000 kg = 0.75 kg
And now, it's only left to calculate molality of the solution:
numbers of moles of solute/kilograms of solvent = 0.493 moles/0.75 kg = 0.657 m
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Answer:
The correct answer is "single replacement".
Explanation:
The activity series is a representation of a series of metals that are organized according to their order of reactivity. They start from the highest order of reactivity to the lowest order of reactivity.
The purpose of the series is to determine which products are formed in single-displacement reactions. The higher-order metals replace the lower order metals if there are two of them in the same solution. If metal is higher in the series it is more reactive than a metal that is below it in the activity series.
Have a nice day!
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Answers
Answer:
Explanation:
The volume of KBr required can be found by using the formula;
c is the concentration in M , mol/dm³ or mol/L
v is the volume in L or dm³
m is the mass in grams
M is the molar mass in g/mol
From the question;
m = 25.5 g
c = 0.716
Molar mass (M) of KBr = 39 + 79.9 = 118.9 g/mol
Answers
Hydro= water
-phobic= fear
Hydrophobic= fear of water, or disliking water
*Think of it like this:
when you mix oil and water, do they mix, or does oil float at the top?
If your reply is "oil float to the top", then you're right. Oil and water DOES NOT mix together. Hope that help!
B.4
C.1
D.2
the answer is a
Answers
Answer:
Its a
Explanation:
I got that answer on my own not from the Question ;)
Final answer:
The third energy level in an atom, as described by quantum mechanics, contains three sublevels: the s, p, and d sublevels.
Explanation:
In the field of chemistry, the term energy level refers to the fixed amount of energy that a system described by quantum mechanics, such as a molecule, atom, electron, or nucleus, can have. Specifically, when we refer to the third energy level, we're talking about an energy state with the principal quantum number n=3.
For any energy level defined by the principal quantum number n, there are n sublevels. Therefore, in a third energy level (n=3), we have three sublevels. These would be the s, p, and d sublevels.
Learn more about energy level here:
#SPJ6
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Photosynthesis is the process in which green plants and some other organisms that makes use of the energy from the sun, converts carbon dioxide and water into glucose (a sugar) and oxygen.
Equation
6 CO2 + 6 H2O → C6H12O6 + 6 O2
The number of moles of oxygen that can be obtained from 25g of water is
= 25g/ 6( (2*1)+(16) )= 25/108
= 0.23mol
Therefore 0.23moles of water yields 0.23 moles of oxygen