A pure substance<span> has a definite and constant composition. A pure substance can be either an element or a compound, but the composition of a pure substance doesn’t vary.</span> Ex: salt or sugar<span>
</span>Mixtures are physical combinations of pure substances that have no definite or constant composition — the composition of a mixture varies according to who prepares the mixture. Ex: sand mixed with salt
Answer:
<h2>119.60 moles</h2>
Explanation:
To find the number of moles in a substance given it's number of entities we use the formula
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
We have the final answer as
<h3>119.60 moles</h3>
Hope this helps you
Answer:
96%
Explanation:
Step 1: Write the balanced neutralization reaction
Al(OH)₃ + 3 HCl ⇒ AlCl₃ + 3 H₂O
Step 2: Calculate the theoretical yield of AlCl₃
According to the balanced equation, the mass ratio of Al(OH)₃ to AlCl₃ is 81.03:133.34.
28 g Al(OH)₃ × 133.34 g AlCl₃/81.03 g Al(OH)₃ = 46 g AlCl₃
Step 3: Calculate the percent yield of AlCl₃
The real yield of AlCl₃ is 44 g. We can calculate the percent yield using the following expression.
%yield = real yield / theoretical yield × 100%
%yield = 44 g / 46 g × 100% = 96%
The nuclear fission process of the power plant bombards the uranium element with a neutron to start a series of reactions to release a large amount of energy. Thus, option B is correct.
<h3>What is nuclear fission?</h3>
Nuclear fission is a process of generating energy by the collision of the neutron particle with the element. The element under collision splits and releases more neutrons.
As the neutrons are produced they collide with more elements resulting in more energy. It is used to convert water into steam and generate electricity.
Therefore, option B. the neutron collides with elements to produce energy in a nuclear power plant.
Learn more about nuclear fission here:
brainly.com/question/23701642
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Answer: 25 moles of product are formed.
Explanation:
The balanced chemical equation will be :
According to stoichiometry :
1 mole of 
require = 3 moles of 
Thus 5 moles of 
will require=
of
Thus is the limiting reagent as it limits the formation of product and is the excess reagent.
As 4 moles of reactant give = 5 moles of product
Thus 20 moles of reactants will give =
of products
