Avogadro's Number Was Established as the Total Number of Units

question 6

Multiple Choice

Avogadro's number was established as the total number of units (atoms or molecules) in a mole, and a mole of any substance is X grams of it, where X is equal to the substance's molecular weight.A standard unit, the mole, allows scientists to calculate concentrations of materials dissolved in solutions.
Example: Sulfur has a molecular weight of 32.Therefore, 32 g of sulfur = 1 mole of sulfur = 6 × 10²³ sulfur atoms.
How many moles and atoms, respectively, are there in 120 grams of sulfur?

• A)3.75; 6 × 10²³
• B)32; 6 × 10²³
• C)1.75; 1.05 × 10²⁴
• D)3.75; 2.25 × 10²⁴

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