how to find percent composition of a compound composed of 16.2 grams of calcium and 28.8 grams of chlorine
1 answer:
This problem is providing us with the mass of calcium and chlorine. Thus, the percent composition of each element in the compound is required and found to be 36 % for calcium and 64 % for chlorine, according to the following:
<h3>Percent compositions:</h3>In chemistry, we can use percent compositions in order to find a relationship between the relative amount of the elements in a compound and the mass of the very same compound.
In this case, given the mass of each element (chlorine and calcium), one can simply divide it by the sum of the masses of both calcium and chlorine to obtain the following:
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Answer:
Choice A. electrons would be required for displacing
of aluminum from a solution of
ions.
Assumption: by " ions" the question meant
with a charge of
on each ion.
Explanation:
The question states that the relative atomic mass of is
. In other words, each mole of
Therefore, that of silver that were formed would contain
of silver atoms.
Metallic silver would precipitate out of this solution only after these ions are turned into
atoms.
One ion carries one unit of positive electrical charge. On the other hand, each
carries one unit of negative electrical charge.
Therefore, each ion will need to gain one electron to form a neutral
atom.
.
At least of electrons would be required to turn
of
ions into that
of silver atoms (which have a mass of
.)
Hence, .
Unlike ions, each aluminum ion
carries three units of positive electrical charge. That is three times the amount of charge on one
ion. Therefore, three electrons will be required to turn one
ion to an
atom.
The question states that the relative atomic mass of is
. Therefore, each mole of
atoms would have a mass
. There would be
of atoms in that
of
.
It takes of electrons to turn one mole of
ions to one mole of
atoms. Hence,
of electrons would be required to produce that
of
atoms (which has a mass of
) from
ions.
That corresponds to the first choice, electrons.
Answer : The question is incomplete, the complete question is attached in answer
To calculate the displacement by Ann's driving from north of her house to south;
we have the data as
In north - 10 km
in south - 5 km
total - 15 km
So we can calculate the displacement, which will be,
10 - 5 = 5 km.
Hence, the displacement will be 5 km
To calculate the displacement by Ann's driving from north of her house to south;
we have the data as
In north - 10 km
in south - 5 km
total - 15 km
So we can calculate the displacement, which will be,
10 - 5 = 5 km.
Hence, the displacement will be 5 km