Moles are the product of the molar concentration and the volume of the solution. The moles of Ferric chloride is 0.118 moles.
<h3>What are moles?</h3>
Moles are the smallest unit of the measurement of atoms and molecules. It is calculated by the molar concentration and the volume of the solution.
Given,
Molar concentration of ferric chloride = 0.762 M
Volume of solution = 0.155 L
Moles are calculated as:

Therefore, 0.118 moles of ferric chloride are present in the sample.
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The answer is option 2, (20 percent)
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Answer:
BaN, Ba₃N₂
Explanation:
In order to determine the empirical formula of a compound, we have to follow a series of steps.
Step 1: Determine the percent composition
Step 2: Divide each percentage by the atomic mass of each element
Step 3: Divide all numbers by the smallest one
Step 4: If necessary, multiply by a number so the coefficients are whole
Compound 1
Step 1
Ba: 90.745%
N: 100% - 90.745% = 9.255%
Step 2
Ba: 90.745/137.33 = 0.66078
N: 9.255/14.01 = 0.6606
Step 3
Ba: 0.66078/0.6606 ≈ 1
N: 0.6606/0.6606 = 1
The empirical formula is BaN.
Compound 2
Step 1
Ba: 93.634%
N: 100% - 93.634% = 6.366%
Step 2
Ba: 93.634/137.33 = 0.68182
N: 6.366/14.01 = 0.4544
Step 3
Ba: 0.68182/0.4544 = 1.5
N: 0.4544/0.4544 = 1
Step 4
Ba: 1.5 × 2 = 3
N: 1 × 2 = 2
The empirical formula is Ba₃N₂.