Question

Please help :)
A compound has the empirical formula C2H3O and a molecular mass of 172 mol. What is its molecular formula?
a. C11H10 05
b. C6H9O3
c. C8H12O4
d. C4H6O2

Answer 1

Empirical formula mass :-

$\\ \tt\Rrightarrow C_2H_3O$

$\\ \tt\Rrightarrow 24+16+3=43g/mol$

n:-

• Molar mass/Empirical formula mass

$\\ \tt\Rrightarrow \dfrac{172}{43}$

$\\ \tt\Rrightarrow 4$

Molecular formula

• 4(C_2H_3O)=C_8H_12O_4