Pd-99 has a half-life of 22.3 hours. how many grams of a 89.8 gram sample would have decayed after exactly three half-lives?
a. 22.90 grams
b. 1.34 grams
c. 11.23 grams
d. 22.3 grams

The correct answer is Option C.

Explanation:

To calculate the amount of sample left for the given half lives, we use the equation:

where,

a = amount of sample decayed = ?

= initial amount of the sample = 89.8 g

n = number of half lives = 3

Putting values in above equation, we get:

Amount of sample decayed after three half lives is 11.23 g

Hence, the correct answer is Option C.

r just means there's a number of carbon in teh chain. for example rcooh means that after x number of carbon, the chain ends with cooh.

explanation: