The half-life of carbon-14 is approximately 6000 years. How much of 800 g of this substance will remain after 30,000 years?

25 g will be left after 30,000

Explanation:

First how many time it decays in 30,000 years: 30,000 ÷ 6000

The answer will be 5 times, it decays.

Now use the formula:

............where m is mass and n is number of times it decays.

Here given mass is 800 g and decays 5 times

Using the formula:

25 g