Question

a compound with molar mass of 34 g/mol contains 5.88%hydrogen,94.12%oxygen.find the molecular formula of the compound

Answer 1

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

Answer 2

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.