Answer:So, one mole of water has a mass of 16 +1+1 = 18 grams. So, if one mole has a mass of 18 grams, 25 grams would have a mass of 25 grams/ 18 grams per mole or 1.39 moles
In response of what like what’s the full clear question
After 100years, sample is 250g
After 200 years, sample is 125g
After 300years, sample is 62.5 g
