KCET 2021 Chemistry Solved Paper

Moles of carbon =

w

M

=

2.4

12

=0.2‌mol
Moles of H in 1.2×1023 atoms of H=

1.2×1023

6×1023

=0.2‌mol
Moles of oxygen atoms =0.2 moles
Now, simplest ratio of the moles of C, H and O is as follows
=C:H:O
=0.2:0.2:0.2=CHO
Thus, the empirical formula of the compound is CHO.