Multiple Choice
In the chemical formula Ca(OH)_2, how many atoms of each element are present in one formula unit?
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2. Atoms & Elements
Calculating Molar Mass
Multiple Choice
Which of the following is the molar mass of Na_2CO_3 (sodium carbonate)?
A
58 g/mol
B
84 g/mol
C
106 g/mol
D
180 g/mol
Verified step by step guidance1
Identify the chemical formula of sodium carbonate, which is \(\mathrm{Na_2CO_3}\).
Determine the atomic masses of each element from the periodic table: sodium (Na), carbon (C), and oxygen (O).
Calculate the total mass contributed by each element by multiplying the atomic mass by the number of atoms in the formula: \(2 \times \mathrm{Na}\), \(1 \times \mathrm{C}\), and \(3 \times \mathrm{O}\).
Add the masses of all elements together to find the molar mass of \(\mathrm{Na_2CO_3}\) using the formula: \(\mathrm{Molar\ mass} = 2 \times M_{Na} + 1 \times M_C + 3 \times M_O\).
Compare the calculated molar mass with the given options to identify the correct molar mass.
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