Question

A 78 gram sample of uranium loses half its mass each year. how much is left after 6 years?

Answer 1

Answer: 1.21875 grams

Step-by-step explanation:

Year 1 : 78/2 = 39 g

Year 2: 39/2 = 19.5 g

Year 3: 19.5/2 = 9.75 g

Year 4: 9.75/2 = 4.875 g

Year 5: 4.875/2= 2.4375 g

Year 6: 2.4375/2 = 1.21875 g

Hope this helps!