Calculate the molecular weight of the following compounds.<br />I need a perfect answer then only I will make you a brainliest answer!!!! please it's urgent !!!
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Answers
Answer:
A compound having molecular mass 30 g/mol is found to contain 80% of carbon and 20% of hydrogen, then the molecular formula of the compound is:
A. C6H6
B.C2H5OH
C.C2H6
D.C2H4
Answer:
C
C
2
H
6
Let the mass of unknown compound be 100 g.
Given that the compound contains 80% of carbon and 20% of hydrogen.
Therefore, weight of carbon in the compound =80g
weight of hydrogen in the compound =20g
Molecular weight of carbon =12g
Molecular weight of hydrogen =1g
∴ moles of carbon in the compound =
12
80
=6.67
Moles of hydrogen in the compound =
1
20
=20Ratio of no. of moles of carbon to no. of moles of hydrogen-
No. of moles of carbon : no. of moles of hydrogen =6.67:20≈1:3
∴ 3 moles of hydrogen are present in the compound for 1 mole of carbon.
Hence, the empirical formula of the compound is CH
3
.
empirical mass=15 g/mol
Molecular formula =(CH
3
)
n
whereas,
n=
empirical mass
molecular mass
=
15
30
=2
Thus, the molecular formula of the compoud is C
2
H
6
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