Answer:
Calculate the percentage by mass of sulfur in tetraoxosulphate(IV) acid,
H
2
S
O
4
.
Percentage by Mass of An Element in a Compound:
The molar mass of an element or a compound tells us the mass of one mole of that substance. For an element, the molar mass can be read off from a periodic table; whereas, for a compound, it needs to be computed manually by adding up the molar masses of the constituent elements while considering the number of atoms of each of them.
If we know the molar mass of an element and that of the compound, then we can proceed to find the ratio of the two, which, when multiplied by 100%, tells us the percentage by mass of that element in the compound.
Answer and Explanation:
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We need to find the molar mass of this acid, sulfuric acid:
2
g
/
m
o
l
+
32
g
/
m
o
l
+
4
(
16
g
/
m
o
l
)
=
98
g
/
m
o
l
.
