A radio active isotope is decaying at a rate of 18% per hour currently there is 100 grams of the substance how much will be left one day from now ?

Question

Also need to find a equation that will represent the number of grams after the hours

Answer 1

The decay factor is (100-18)%=0.82 per hour. So the equation we need is m=100(0.82)ʰ where m is the mass in grams and h the time in hours. Plug in h=24 and we get m=100×0.00854=0.854 grams approx.