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# The half-life of the radioactive elements unobtanium -53 is 10 seconds. If 176 grams of unobtanium -41 are initially present, how many grams are

The half-life of the radioactive elements unobtanium -53 is 10 seconds. If 176 grams of unobtanium -41 are initially present, how many grams are present after 5 seconds? 10 seconds? 15 second? 20 seconds? 25 seconds?