a compound with molar mass of 34 g/mol contains 5.88%hydrogen,94.12%oxygen.find the molecular formula of the compound
Answers
Answer:
Answer is H2O2
Explanation:
- Mass of hydrogen = 5.88
- Atomic mass of hydrogen = 1
- No. of moles in hydrogen = 5.88 / 1 = 5.88g
- Mass of oxygen = 94.12/16 = 5.88
- Empirical formula = HO
- Molar mass = 17g
- r = 34 / 17 = 2
- Molecular formula = H2O2
Given:
The molar mass of a compound=34g/mol
Percentage of Hydrogen=5.88%
Percentage of Oxygen=94.12%
To find:
The molecular formula of a compound
Solution:
We can find the solution by following the given process-
We know that to find the molecular formula we need to find the molar mass of the compound and its empirical formula mass.
The atomic mass of Hydrogen is 1 and its mass is 5.88.
So, the number of moles in Hydrogen= Mass/ Atomic mass
=5.88/1
=5.88g
Similarly, the number of moles in oxygen= 94.12/16
=5.88g
The empirical formula is H1O1 so the empirical formula mass will be 1+16= 17g
The number of units= Molar mass of compound/ Empirical formula mass
=34/17
= 2
So, the molecular formula is H2O2.
Therefore, the molecular formula is H2O2.