Answer all assigned questions and problems, and show all work. How many atoms ar

Question

Answer all assigned questions and problems, and show all work.

How many atoms are there in 5.10 moles of sulfur (S)? (6 points)

(Reference: Chang 3.13)

How many moles of calcium (Ca) atoms are there in 77.4 g of Ca? (6 points)

(Reference: Chang 3.15)

What is the mass in grams of 1.00 × 1012 lead (Pb) atoms? (8 points)

(Reference: Chang 3.19)

Describe how you would determine the isotopic abundance of an element from its mass spectrum. (6 points)

(Reference: Chang 3.32)

Cinnamic alcohol is used mainly in perfumery, particularly in soaps and cosmetics. Its molecular formula is C9H10O.

Calculate the percent composition by mass of C, H, and O in cinnamic alcohol. (8 points)

How many molecules of cinnamic alcohol are contained in a sample of mass 0.469 g? (8 points)

How many carbon atoms are in 0.469 g of cinnamic alcohol? (8 points)

Explanation / Answer

1.

We know that 1 mole of sulphur would contain 6.022×1022 atoms of sulphur.

5.10 mole of sulphur would contain 5.1×6.022×1023 atoms=30.7122×1023 atoms

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