Avogadro's number, calculated from the atomic weight of hydrogen, tells us how many atoms or molecules are in a mole. The resulting base for all calculations of moles and molarity (how many molecules are present when you weigh out a substance or measure from a stock solution) is the following: 1 g of hydrogen atoms = 6 × 1023 hydrogen atoms = 1 mole of hydrogen Sulfur has a molecular weight of 32. How many moles and atoms are there in 120 grams of sulfur?
(a) 3.75 and 6 × 1023
(b) 32 and 6 × 1023
(c) 1.75 and 1.05 ×1024
(d) 3.75 and 2.25 × 1024
Answer: D
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