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
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
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