Question

HELP ASAP PLEASE

Carbon-14 has a half-life of 10 days.
How many grams of a 80 g sample
will remain after 60 days?

Answer 1

• 1.25 g

Explanation:

Given:

• Initial mass is m = 80 g.
• Half life = 10 days
• Total time = 60 days

Number of half-life periods:

• r = 60/10 = 6

Equation for remaining sample:

• s = m*(1/2)^r
• s = 80*(1/2)^6 = 80/64 = 1.25 g