Answer:
The correct answer is -
A. 12.5%
B. 105 grams.
Step-by-step explanation:
Half-life is the amount of time requires to decay or convert half of the atoms of the compound or element. It is denoted by the t1/.
In this question, it is given that an element has a half-life of two days which means it becomes half of the initial amount in two days.
A. So, after six days the percentage of the amount remaining that would be
= 50*1/3
(6 days = three half-life cycle) and (one-half cycle = 50% of initial value)
= 12.5% of its initial value.
B. If the original amount of the element was 120 gram then the amount of element that decayed in six days would be:
= Initial value - remain value
= 120 - (120*12.5/100)
= 120 -15 grams
= 105 grams.