To calculate the molecular weight of a compound, you need to sum up the atomic weights of all the atoms present in the molecular formula. The atomic weights can be found on the periodic table.
CaCO3 (Calcium Carbonate):
Calcium (Ca) has an atomic weight of approximately 40.08 g/mol.
Carbon (C) has an atomic weight of approximately 12.01 g/mol.
Oxygen (O) has an atomic weight of approximately 16.00 g/mol.
Molecular Weight of CaCO
3
=
(
1
×
Atomic Weight of Ca
)
+
(
1
×
Atomic Weight of C
)
+
(
3
×
Atomic Weight of O
)
Molecular Weight of CaCO
3
=(1×Atomic Weight of Ca)+(1×Atomic Weight of C)+(3×Atomic Weight of O)
Molecular Weight of CaCO
3
=
(
1
×
40.08
)
+
(
1
×
12.01
)
+
(
3
×
16.00
)
Molecular Weight of CaCO
3
=(1×40.08)+(1×12.01)+(3×16.00)
Molecular Weight of CaCO
3
≈
100.09
g/mol
Molecular Weight of CaCO
3
≈100.09g/mol
H2SO4 (Sulfuric Acid):
Hydrogen (H) has an atomic weight of approximately 1.01 g/mol.
Sulfur (S) has an atomic weight of approximately 32.07 g/mol.
Oxygen (O) has an atomic weight of approximately 16.00 g/mol.
Molecular Weight of H
2
SO
4
=
(
2
×
Atomic Weight of H
)
+
(
1
×
Atomic Weight of S
)
+
(
4
×
Atomic Weight of O
)
Molecular Weight of H
2
SO
4
=(2×Atomic Weight of H)+(1×Atomic Weight of S)+(4×Atomic Weight of O)
Molecular Weight of H
2
SO
4
=
(
2
×
1.01
)
+
(
1
×
32.07
)
+
(
4
×
16.00
)
Molecular Weight of H
2
SO
4
=(2×1.01)+(1×32.07)+(4×16.00)
Molecular Weight of H
2
SO
4
≈
98.09
g/mol
Molecular Weight of H
2
SO
4
≈98.09g/mol
HNO3 (Nitric Acid):
Hydrogen (H) has an atomic weight of approximately 1.01 g/mol.
Nitrogen (N) has an atomic weight of approximately 14.01 g/mol.
Oxygen (O) has an atomic weight of approximately 16.00 g/mol.
Molecular Weight of HNO
3
=
(
1
×
Atomic Weight of H
)
+
(
1
×
Atomic Weight of N
)
+
(
3
×
Atomic Weight of O
)
Molecular Weight of HNO
3
=(1×Atomic Weight of H)+(1×Atomic Weight of N)+(3×Atomic Weight of O)
Molecular Weight of HNO
3
=
(
1
×
1.01
)
+
(
1
×
14.01
)
+
(
3
×
16.00
)
Molecular Weight of HNO
3
=(1×1.01)+(1×14.01)+(3×16.00)
Molecular Weight of HNO
3
≈
63.02
g/mol
Molecular Weight of HNO
3
≈63.02g/mol
These are the approximate molecular weights of the given compounds.
Answers & Comments
Answer:
Explanation:
To calculate the molecular weight of a compound, you need to sum up the atomic weights of all the atoms present in the molecular formula. The atomic weights can be found on the periodic table.
CaCO3 (Calcium Carbonate):
Calcium (Ca) has an atomic weight of approximately 40.08 g/mol.
Carbon (C) has an atomic weight of approximately 12.01 g/mol.
Oxygen (O) has an atomic weight of approximately 16.00 g/mol.
Molecular Weight of CaCO
3
=
(
1
×
Atomic Weight of Ca
)
+
(
1
×
Atomic Weight of C
)
+
(
3
×
Atomic Weight of O
)
Molecular Weight of CaCO
3
=(1×Atomic Weight of Ca)+(1×Atomic Weight of C)+(3×Atomic Weight of O)
Molecular Weight of CaCO
3
=
(
1
×
40.08
)
+
(
1
×
12.01
)
+
(
3
×
16.00
)
Molecular Weight of CaCO
3
=(1×40.08)+(1×12.01)+(3×16.00)
Molecular Weight of CaCO
3
≈
100.09
g/mol
Molecular Weight of CaCO
3
≈100.09g/mol
H2SO4 (Sulfuric Acid):
Hydrogen (H) has an atomic weight of approximately 1.01 g/mol.
Sulfur (S) has an atomic weight of approximately 32.07 g/mol.
Oxygen (O) has an atomic weight of approximately 16.00 g/mol.
Molecular Weight of H
2
SO
4
=
(
2
×
Atomic Weight of H
)
+
(
1
×
Atomic Weight of S
)
+
(
4
×
Atomic Weight of O
)
Molecular Weight of H
2
SO
4
=(2×Atomic Weight of H)+(1×Atomic Weight of S)+(4×Atomic Weight of O)
Molecular Weight of H
2
SO
4
=
(
2
×
1.01
)
+
(
1
×
32.07
)
+
(
4
×
16.00
)
Molecular Weight of H
2
SO
4
=(2×1.01)+(1×32.07)+(4×16.00)
Molecular Weight of H
2
SO
4
≈
98.09
g/mol
Molecular Weight of H
2
SO
4
≈98.09g/mol
HNO3 (Nitric Acid):
Hydrogen (H) has an atomic weight of approximately 1.01 g/mol.
Nitrogen (N) has an atomic weight of approximately 14.01 g/mol.
Oxygen (O) has an atomic weight of approximately 16.00 g/mol.
Molecular Weight of HNO
3
=
(
1
×
Atomic Weight of H
)
+
(
1
×
Atomic Weight of N
)
+
(
3
×
Atomic Weight of O
)
Molecular Weight of HNO
3
=(1×Atomic Weight of H)+(1×Atomic Weight of N)+(3×Atomic Weight of O)
Molecular Weight of HNO
3
=
(
1
×
1.01
)
+
(
1
×
14.01
)
+
(
3
×
16.00
)
Molecular Weight of HNO
3
=(1×1.01)+(1×14.01)+(3×16.00)
Molecular Weight of HNO
3
≈
63.02
g/mol
Molecular Weight of HNO
3
≈63.02g/mol
These are the approximate molecular weights of the given compounds.
Verified answer
Explanation:
i.CaCo3 - 100.0869 g/mol
ii. H2So4 -98.079 g/mol
iii. HNO3 - 63.01 g/mol