객관식
What is the mass of 7.00 mol of silver nitrate (AgNO_3)?
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2. Atoms & Elements
Calculating Molar Mass
객관식
What is the percent by mass of calcium in CaBr2?
A
22.5%
B
40.0%
C
18.4%
D
11.2%
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검증된 단계별 안내1
Identify the chemical formula of the compound, which is CaBr\_2, meaning it contains 1 calcium (Ca) atom and 2 bromine (Br) atoms.
Find the atomic masses of each element from the periodic table: calcium (Ca) is approximately 40.1 g/mol, and bromine (Br) is approximately 79.9 g/mol.
Calculate the molar mass of CaBr\_2 by adding the atomic mass of calcium to twice the atomic mass of bromine: \(M_{CaBr_2} = M_{Ca} + 2 \times M_{Br}\).
Calculate the percent by mass of calcium in CaBr\_2 using the formula: \(\% \text{Ca} = \left( \frac{M_{Ca}}{M_{CaBr_2}} \right) \times 100\%\).
Substitute the values into the formula and simplify to find the percent by mass of calcium in the compound.
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