Question #96a4f

1 Answer
Mar 25, 2017

The empirical formula is "CuS"_2.

Explanation:

An empirical formula is the simplest whole number molar ratio of the elements in a compound.

Your compound contains "0.768 mol Cu" and "1.56 mol S".

I like to summarize the calculations in a table.

bb("Element"color(white)(m) "Moles"color(white)(m) "Ratio"color(white)(m)color(white)(l)"Integers")
color(white)(m)"Cu" color(white)(mmmll)0.768 color(white)(Xm)1color(white)(mmmmmll)1
color(white)(m)"S"color(white)(mmmml)1.56" color(white)(Xmll)2.03 color(white)(mmmml)2

There is 1 mol of "Cu" for 2 mol of "S".

The empirical formula is "CuS"_2.