Question

an organic compound contains 20%carbon, 6.7%hydrogen , 46.67%nitrogen and 26.63%oxygen calculate emperical formula ​

Answer 1

Explanation:

If percentage are given then we are taking total mass is 100 grams.

So, the mass of each element is equal to the percentage given.

Mass of C = 20 g

Mass of H = 6.7 g

Mass of N = 46.67 g

Mass of O = 100 -(20+6.7+46.67) = 26.63

Step 1 : convert given masses into moles.

Moles of C =

Moles of H =

Moles of N =

Moles of O =

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For C =

For H =

For N =

For O =

The ratio of C:H:N :O= 1 :4: 2:1

Hence the empirical formula is .

equivalent weight = 12(1)+1(4)+14(2)+16(1)= 60g/mol

The molecular weight = 60 g/mole

Now we have to calculate the molecular formula.

The molecular formula will be=

Thus the molecular formula will be