The mass of the element after 20 minutes can be calculated by subtracting 21.6% of its original mass from the initial value each minute for 20 minutes. In this case, the original mass is 140 grams and 21.6% of 140 grams is 30.24 grams; therefore, after one minute, 109.76 g (140 – 30.24) will remain of the element’s initial weight. After two minutes, 79.52 g (109.76 -30.24) will remain and so forth until all 20 minutes have elapsed.
Using this method, it can be determined that 35.2 g (109.76 – 74.56) will remain at the end of 20 minutes:
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