Multiple Choice
What is the mass percent of lithium in lithium nitride (Li3N)?
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3. Chemical Reactions
Mass Percent
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What is the percent composition of chromium in BaCrO_4 (barium chromate)?
A
25.0%
B
20.5%
C
21.6%
D
32.0%
Verified step by step guidance1
Identify the chemical formula of the compound: BaCrO_4, which contains barium (Ba), chromium (Cr), and oxygen (O).
Find the atomic masses of each element from the periodic table: Ba, Cr, and O. For example, Ba ≈ 137.33 g/mol, Cr ≈ 51.996 g/mol, and O ≈ 15.999 g/mol.
Calculate the molar mass of BaCrO_4 by summing the atomic masses of all atoms in the formula: Molar mass = mass of Ba + mass of Cr + 4 × mass of O.
Determine the mass percent of chromium by dividing the atomic mass of chromium by the molar mass of BaCrO_4 and then multiplying by 100% using the formula: \(\text{Percent Cr} = \left( \frac{\text{mass of Cr}}{\text{molar mass of BaCrO}_4} \right) \times 100\%\).
Interpret the result to find the percent composition of chromium in BaCrO_4 and compare it to the given options.
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