# Problem: A chemist decomposes samples of several compounds; the masses of their constituent elements are listed. Calculate the empirical formula for each compound.2.677 g Ba, 3.115 g Br

###### FREE Expert Solution

Step 1: Calculate the %Mass of Ba and Br

We need to determine the mass percent of Ba and Br in the compound. Recall that mass percent is given by:

First, we calculate the total mass

Total mass = 5.792 g

The mass percent of Ba is

%Ba = 46.22%

The mass percent of Br is

% Br = 53.78%

Step 2: Calculate the moles of Ba and Br

Assuming we have 100 g of the compound, this means we have 46.22 g Ba and 53.78 g Br. Now, we need to get the moles of each element in the compound. The atomic masses are 137.33 g/mol Ba and 79.90 g/mol Br.

The moles of Ba in the compound is:

moles of Ba = 0.3366 mol Ba

The moles of Br in the compound is:

moles of Br = 0.6731 mol Br

Step 3: Determine the lowest whole number ratio of Ba and Br to get the empirical formula

86% (21 ratings) ###### Problem Details

A chemist decomposes samples of several compounds; the masses of their constituent elements are listed. Calculate the empirical formula for each compound.

2.677 g Ba, 3.115 g Br

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Empirical Formula concept. You can view video lessons to learn Empirical Formula. Or if you need more Empirical Formula practice, you can also practice Empirical Formula practice problems.