Answer to Question #113521 in General Chemistry for Mohammed Al-fatlawi

Question

A compound has been found to be made up of 5.200g chromium, 4.815g sulfur and 9.600g oxygen. Find the empirical formula of this compound.

Answer 1

Moles of chromium = $\frac{5.2}{52}= 0.1$

Moles of sulfur = $\frac{4.815}{32}=0.15$

Moles of oxygen = $\frac{9.6}{16}= 0.6$

So

$Cr:S:O= 0.1:0.15:0.6$

Multiply by 2

We get $Cr:S:O= 2:3:12$

So empirical formula is -

$$Cr_2S_3O_{12}$$