Question

A compound has an empirical formula of CH₂O. What is its molecular formula, if its molecular mass is 90 g/mol?

(C=12.01 amu, H=1.008 amu, O=16.00 amu)

A: C3H6O3
B: C9H1809

i need help asap, will give brainliest and 50 points, as this is on my final :)

Answer 1

Empirical formula mass

$\\ \tt{:}\dashrightarrow 12+2+16$

$\\ \tt{:}\dashrightarrow 30g/mol$

n:-

$\\ \tt{:}\dashrightarrow \dfrac{Molecular\:mass}{Empirical\:mass}$

$\\ \tt{:}\dashrightarrow \dfrac{90}{30}$

$\\ \tt{:}\dashrightarrow 3$

Molecular formula

$\\ \tt{:}\dashrightarrow n\times Empirical\: formula$

$\\ \tt{:}\dashrightarrow 3(CH_2O)$

$\\ \tt{:}\dashrightarrow C_3H_6O_3$