Multiple Choice
Which of the following is the molar mass of gold (Au)?
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2. Atoms & Elements
Calculating Molar Mass
Multiple Choice
Which of the following is the correct molar mass of calcium carbonate (CaCO_3)?
A
84.08 g/mol
B
60.08 g/mol
C
100.09 g/mol
D
40.08 g/mol
Verified step by step guidance1
Identify the chemical formula of calcium carbonate, which is CaCO\_3. This means it contains 1 calcium (Ca) atom, 1 carbon (C) atom, and 3 oxygen (O) atoms.
Find the atomic masses of each element from the periodic table: calcium (Ca) is approximately 40.08 g/mol, carbon (C) is approximately 12.01 g/mol, and oxygen (O) is approximately 16.00 g/mol.
Calculate the total mass contributed by each element by multiplying the atomic mass by the number of atoms in the formula: for Ca, multiply 40.08 g/mol by 1; for C, multiply 12.01 g/mol by 1; for O, multiply 16.00 g/mol by 3.
Add all these contributions together to find the molar mass of CaCO\_3: Molar mass = (1 \(\times\) 40.08) + (1 \(\times\) 12.01) + (3 \(\times\) 16.00).
Sum the values to get the total molar mass of calcium carbonate, which will help you identify the correct answer from the given options.
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