Question

Question #0dfbd

Answer 1

Quite easy. Follow the steps below.

Explanation:

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`