%yield = 86.93%
Given
Reaction
CaCN₂+3H₂O=>CaCO₃+2NH₃
Required
The percent yield
Solution
mol CaCN₂(MW= 92 g/mol) :
= mass : MW
= 77 g : 92 g/mol
= 0.834
From equation, mol NH₃ :
= 2/1 x mol CaCN₂
= 2/1 x 0.834
= 1.668
Mass NH₃(theoretical):
= 1.668 mol x 18 g/mol
= 30.024 g
% yield = (actual/theoretical) x 100%
%yield = (26.1/30.024) x 100%
%yield = 86.93%
Answer:
[BrCl] = 0,13M
Explanation:
For the reaction:
Br₂(g) + Cl₂(g) ⇄ 2BrCl
kc = [BrCl]²/[Br₂] [Cl₂] (1)
If initial [Br₂] and [Cl₂] are 0,25mol/3,0L=0,083M and 0,55mol/3,0L=0,18M, the concentrations in equilibrium are:
[Br₂] = 0,083M - x
[Cl₂] = 0,18M - x
[BrCl] = 2x
Replacing in (1)
7 = (2x)²/ (0,083 - x)(0,18 - x)
7 = 4x²/ x²- 0,263x + 0,01494
7x² - 1,841x + 0,10458 = 4x²
3x² - 1,841x + 0,10458 = 0
Solving for x:
x = 0,0633. As [BrCl] = 2x. [BrCl] = 0,13M
I hope it helps!
protons
neutrons
electrons
Answer: Option (4) is the correct answer.
Explanation:
Atomic mass of an atom or element means the total number of protons and total number of neutrons present.
Whereas atomic number means the total number of protons present in an atom or element.
In period 5 on the Periodic Table, elements from left to right are arranged in order of increasing atomic number.
On the other hand, the atomic mass is not increasing from left to right.
Answer:
Two
Step-by-step explanation:
There are two ways to determine the number sets of equivalent protons in a compound.
(a) By substitution
Replace each H with a different group and see if you get a different compound
For example, the six CH₃ H atoms are an equivalent set, because, if I replace any one of them, I will always get the same compound: 1-chloromethyl-4-methylbenzene (Fig. 1).
Similarly, the four aromatic H atoms are an equivalent set. If I replace any one of them, I will always get the same compound: 2-chloro-1,4-dimethylbenzene (Fig. 2).
Thus, there are two sets of equivalent protons in p-xylene.
(b) By symmetry
Two atoms are equivalent if one can be converted into the other by a symmetry operation on the molecule.
The methyl hydrogens can be interconverted by a combination of reflections about the AB and CD mirror planes and byrotations about the C-C bonds to the ring (Fig. 3).
Similarly, the four aromatic H atoms can be interconverted by a combination of reflections about the AB and CD mirror planes.
Again, we find two sets of equivalent protons.
B. the size of the particles in a gas
C. the constant motion of the particles in a gas
Answer: Option (A) is the correct answer.
Explanation:
It is known that particles of a gas are held by weak Vander waal forces, therefore, there is no force of attraction between gas molecules.
As a result, these particles are in random motion.
Thus, we can conclude that out of the given options, the constant motion of the particles in a gas allows a gas to fill a container.