Question

17. We know two different compounds may have the same empirical formula. Can you identify the pair with the same emperical formula? * 1 point C2H4 and C4H6 NO2 and N2O5 NO2 and N2O4 C2H4 and C3H8

Answer 1

Answer: NO2 and N2O4

both have empirical formula as NO2

Explanation:

Answer 2

As per the formula,

Molecular formula = n(empirical formula)

In order to find the empirical formula of the compound we need to remove the common no from the compound

(1)

In C 2 H 4 we can take 2 as the common no

C 2 H 4 = 2( C H 2)

The empirical formula of C 2 H 4 is C H 2

C 4 H 6

In C 4 H 6 we can take 2 as the common no

C 2 H 4 = 2( C2 H 3)

The empirical formula of C 4H 6 is C 2H 3

(2)

In N 20 nothing can be taken as common so empirical formula = molecular formula

In N 2 O 5 also nothing can be taken as common so empirical formula = molecular formula

(3)

In N 20 nothing can be taken as common so empirical formula = molecular formula

In N 2 O 4 we can take 2 as the common no

N 2 O 4= 2( N 2O )

The empirical formula is N 2 O

N 20 and N 2 O 4 have similar empirical formulas