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SAT® Subject Test in Chemistry

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Moderate

Calculating an Empirical Formula

SATCHM-4JX4LA

Experimental analysis shows that a compound contains 0.015 moles of iron and 0.0225 moles of sulfur.

What is the empirical formula of this compound?

A

$Fe_2S_3$

B

$Fe_3S$

C

$FeS$

D

$Fe_7S_8$

E

$FeS_2$