amount remaining initial amount 1 2 n Chapter 11 Nuclear Chemistry 112 Half

# Amount remaining initial amount 1 2 n chapter 11

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amount remaining = initial amount × ( 1 2 ) n Chapter 11 Nuclear Chemistry 11.2 Half-Life 547
EXAMPLE 3 The half-life of 20 F is 11.0 s. If a sample initially contains 5.00 g of 20 F, how much 20 F remains after 44.0 s? Solution If we compare the time that has passed to the isotope’s half-life, we note that 44.0 s is exactly 4 half-lives, so using the previous equation, n = 4. Substituting and solving results in the following: Less than one-third of a gram of 20 F remains. SKILL-BUILDING EXERCISE 1.The half-life of44Ti is 60.0 y. A sample initially contains 0.600 g of44Ti. Howmuch44Ti remains after 180.0 y?

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