Given the balanced equation representing a reaction:C3H8(g) + 5O2(g)==>3CO2(g) + 4H2O(g)
What is the total number of moles of O2(g) required for the complete combustion of 1.5 moles of C3H8(g)?
(1) 0.30 mol (3) 4.5 mol
(2) 1.5 mol (4) 7.5 mol
Answers
To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. The moles of oxygen required is 7.5 mol.
What is stoichiometry?
Stoichiometry is a part of chemistry that help us in making relationship between reactant and product from quantitative aspects.
The balanced equation is
CH
(g) + 5O
(g)
3CO
(g) + 4H
O(g)
The mole ratio of CH
to oxygen is 1:5, means 1 mole of C
H
will react with 5 mole of oxygen. So, if we take 1.5 moles of C
H
then the amount of oxygen that will be produced will be 5 times the moles of
CH
. The moles of oxygen required to react with 1.5 moles of C
H
= 5× 1.5mol. Moles of oxygen required to react with 1.5 moles of C
H
=7.5 mol.
Therefore the moles of oxygen required is 7.5 mol.
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Answers
Answers
Taking into account the definition of dilution, the molarity of the diluted solution is 0.125 M.
Dilution
When it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.
Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
- Ci: initial concentration
- Vi: initial volume
- Cf: final concentration
- Vf: final volume
Final molarity
In this case, you know:
- Ci= 0.15 M
- Vi= 125 mL
- Cf= ?
- Vf= 125 mL + 25 mL= 150 mL
Replacing in the definition of dilution:
0.15 M× 125 mL= Cf× 150 mL
Solving:
(0.15 M× 125 mL)÷ 150 mL= Cf
0.125 M= Cf
In summary, the molarity of the diluted solution is 0.125 M.
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Answer:
0.125 M
Explanation:
M₁V₁ = M₂V₂
125 mL / 1000 = 0.125 L = V₁
25 + 125 = 150 mL / 1000 = 0.150 L = V₂
0.15 M = M₁
M₁ × V₁ / V₂ = M₂
(0.15) × (0.125) / (0.150) = 0.125 M
0.125 M is the answer
Some molecules may contain no atoms.
B.
Some elements found in nature exist as molecules.
C.
Some compounds include only one type of element.
D.
Some atoms are made of two or more different elements. Which of these statements is true?
A.
Some molecules may contain no atoms.
B.
Some elements found in nature exist as molecules.
C.
Some compounds include only one type of element.
D.
Some atoms are made of two or more different elements.
Answers
What is the percent yield of NH3 if the reaction of 26.3 g of H2 produces 79.0 g of NH3?
Answers
The balanced chemical reaction is:
N2 + 3H2 = 2NH3
We are given the amount of H2 being reacted. This will be our starting point.
26.3 g H2 (1 mol H2 / 2.02 g H2) 2 mol O2/3 mol H2) ( 17.04 g NH3 / 1mol NH3) = 147.90 g O2
Percent yield = actual yield / theoretical yield x 100
Percent yield = 79.0 g / 147.90 g x 100
Percent yield = 53.4%
Answers
The number of electrons in a completely filled second shell of an atom will be 8.
What is atom?
The basic number of ordinary components that make up a chemical element is just an atom.
What is shell?
As per Bohr's atomic model, electrons orbit or shell surrounding the nucleus in a precise circular path.
It is known that by the electronic configuration atoms posses 2,8,18,32.
Hence, there are 8 electron will be found in second shell of the atom.
The number of electrons in a completely filled second shell of an atom will be 8.
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Hope this helped.