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If you weigh out 0.205 g of salicylic acid (C7H6O3), what is the number of moles of salicylic acid present? (Molar mass of C7H6O3 = 138.12 g/mol)
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2. Atoms & Elements
Calculating Molar Mass
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Where can you find the molar mass of an element when performing calculations in general chemistry?
A
On the laboratory safety data sheet (SDS)
B
On the periodic table, listed as the atomic mass
C
By measuring the element's volume
D
In the chemical equation's coefficients
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Understand that the molar mass of an element is the mass of one mole of that element, usually expressed in grams per mole (g/mol).
Recall that the molar mass corresponds to the atomic mass of the element, which is typically found on the periodic table.
Recognize that the atomic mass listed on the periodic table is a weighted average of all naturally occurring isotopes of that element.
Note that the laboratory safety data sheet (SDS) provides safety and handling information, not molar mass values.
Understand that measuring volume or looking at chemical equation coefficients does not provide molar mass information.
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