The amount, in grams, that will remain of the isotope will be 2.75 grams
Half-life
It is the time it takes for a given amount of radioactive substance to decay into half of its original amount.
The half-life is 15 hours. This means that the amount is halved every 15 hours.
If the starting amount is 22 grams, it will become 11 grams (22/2) after the first 15 hours. The 11 grams will become 5.5 grams (11/2) after another 15 hours, making 30 hours.
The 55.5 grams remaining will become 2.75 grams (5.5/2) if another 15 hours should pass, making a total of 45 hours that have passed.
Thus, only 2.75 grams of the isotope will remain in 45 hours.
More on half-life can be found here: https://brainly.com/question/24710827
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