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Answer 1 · 2017-03-22T01:30:09

Quite easy. Follow the steps below.

In a scenario like this, assume you have #100g# of the compound.

So for each element, the percent is the total percent of #100g#.

#Na = 35.4 g#
#As = 39.1 g#
#O = 25.0 g #

Now, you will convert grams to moles for each element. Find the molar mass of each element from the periodic table and plug in.

#Na = (35.4 g)/1 * (1 mol)/(23g) = 1.5 mol#
#As = (39.1g)/1 * (1 mol)/(75g) = 0.5 mol#
#O = (25.0 g)/1 * (1 mol)/(16g) = 1.5 mol#

Now, divide every answer by the smallest number, which in this case is 0.5.

#(1.5 mol)/(0.5mol) = 3#

#(0.5 mol)/(0.5mol) = 1#

#(1.5 mol)/(0.5mol) = 3#

These numbers are going to give you the ratios of the elements in the compound to give you an empirical formula.

#Na_3As_1O_3#