0.250 moles of NaCl is dissolved in 0.850 L of solution. What is the molar concentration?
1 answer:
Considering the definition of molarity, the molar concentration is 0.294 .
Molarity reflects the concentration of a solution indicating the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:
Molarity is expressed in units .
In this case, you know:
- amount of moles of solute= 0.250 moles
- volume= 0.850 L
Replacing in the definition of molarity:
Solving:
molarity= 0.294
Finally, the molar concentration is 0.294 .
Learn more about molarity with this example: brainly.com/question/15406534?referrer=searchResults
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Answer:
Approximately , assuming that this reaction took place under standard temperature and pressure, and that
behaves like an ideal gas. Also assume that the reaction went to completion.
Explanation:
The first step is to find out: which species is the limiting reactant?
Assume that is the limiting reactant. How many moles of
would be produced?
Look up the relative atomic mass of ,
, and
on a modern periodic table:
:
.
:
.
:
.
Calculate the formula mass of :
.
Calculate the number of moles of formula units in of
using its formula mass:
.
In the balanced chemical equation, the ratio between the coefficient of and that of
is
.
In other words, for each mole of formula units consumed, one mole of
would be produced.
If is indeed the limiting reactant, all that approximately
of
formula would be consumed. That would produce approximately
of
.
On the other hand, assume that is the limiting reactant.
Convert the volume of to
(so as to match the unit of concentration.)
.
Calculate the number of moles of molecules in that
of this
.
Notice that in the balanced chemical reaction, the ratio between the coefficient of and that of
is
.
In other words, each mole of molecules consumed would produce only
of
molecules.
Therefore, if is the limiting reactant, that
of
molecules would produce only one-half as many (that is,
) of
molecules.
If is the limiting reactant,
of
molecules would be produced. However, if
is the limiting reactant,
of
molecules would be produced.
In reality, no more than of
molecules would be produced. The reason is that all
would have been consumed before
was.
After finding the limiting reactant, approximate the volume of the produced.
Assume that this reaction took place under standard temperature and pressure (STP.) Under STP, the volume of one mole of ideal gas molecules would be approximately .
If behaves like an ideal gas, the volume of that
of
molecules would be approximately
.
Explanation :
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(b)
This reaction is a redox reaction or oxidation-reduction reaction in which sulfur get oxidized and oxygen get reduced.
(c)
This reaction is a combination reaction in which the two reactants molecule combine to form a large molecule or product.
(d)
This reaction is a decomposition reaction in which a large molecule or reactant decomposes to give two or more molecule or products.
(e)
This reaction is a double displacement reaction in which the cation of two reactants molecule exchange their places to give two different products.
(f)
This reaction is a combination reaction in which the two reactants combine to form a large molecule or product.
(g)
This reaction is a double displacement reaction in which the cation of two reactants molecule exchange their places to give two different products.
(h)
This reaction is combustion reaction in which a hydrocarbon react with an oxygen to give carbon dioxide and water as a products.