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Chapter3-examples

# Chapter3-examples - Naturally occurring lithium is 7.42...

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Naturally occurring lithium is: 7.42% 6 Li (6.015 amu) 92.58% 7 Li (7.016 amu) 7.42% x 6.015 + 92.58% x 7.016 = 6.941 amu Average atomic mass of lithium:

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Calculation of Average Atomic Mass Chlorine exists in two isomeric forms: 35 Cl and 37 Cl. The abundance of each isomer is 75.771 % and 24.229%, respectively. The masses of each isomer are 34.9688 amu and 36.9659 amu based on Mass Spectral analysis of 35 Cl and 37 Cl. The average atomic mass of chlorine is equal to (0.75771)×(34.9688 amu) + (0.24229)×(36.9659 amu) = 35.4527 amu (same as in periodic table)
A) 12 g B) 6.02 x 10 23 g C) 1.66 x 10 -24 g D) 12 x (1.66 × 10 -24 ) g How much does an atom of How much does an atom of 12 12 C weigh? C weigh? A) 12 g B) 12 × (1.66 × 10 -24 ) g C) 6 × (1.66 × 10 -24 ) g D) 6 ÷ 1.66 × 10 -24 g 1 amu = 1.66 x 10 -24 g How much would 6.02 x 10 How much would 6.02 x 10 23 23 12 12 C atoms weigh? C atoms weigh?

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x 6.022 x 10 23 atoms 1 mol = How many atoms are in 0.551 g of potassium (K) ? 1 mol K = 39.10 g 1 mol = 6.022 x 10 23 atoms 0.551 g 1 mol 39.10 g x 8.49 x 10 21 atoms
Ex: Molecular Weight of Water and Hydrogen Peroxide Water: – Formula is H 2 O – MW in amu = 2×H + 1×O = 2×(1.008) + 1×(16.00) = 18.02 amu Hydrogen peroxide: – Formula is H 2 O 2 – MW = 2×H + 2×O = 2×(1.008) + 2×(16.00) = 34.02 amu

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How many H atoms are in 72.5 g of C
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