science

posted by .

If the half-life of a 20.0g is known to be 24 minutes, how long will it take for only 5.0 grams of the sample to remain

A.6 minutes
B.24 minutes
C.48 minutes
D.96 minutes

I NEED HELP!!!!

  • science -

    IS IT.....C?

  • science -

    5g is 1/4 of 20g, so that's 2 half-lives

    2x24 = 48 minutes, so you are correct.

  • science -

    Hey! That's just what I'm trying to figure out! Maybe you ca help me!

  • science -

    i think its c but i'm not sure science is not my strong suit. this one is difficult.

  • science -

    Its c

  • science -

    i realy dont know

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Half-Life

    Can someone please show me a detailed solution to this problem?
  2. Half-Lifes

    How much of a 6gram sample of silver-105m would remain after 4 minutes?
  3. math

    use : .# x 6 = minutes I did try to do it but came up with numbers like 5.732360456. Plz help P.S. Trying to help my son but can't 0.5 ='s how many hours and minutes 2.5 ='s how many hours and minutes 2.3 ='s how many hours and minutes …
  4. stat

    An oil change company advertises that they can change the oil in your car in 15 minutes. Based on the data collected below, what is the probability that oil change will take more than 15 minutes?
  5. Science- Radioactive Dating

    Which of the following statements about radioactive dating is true?
  6. math

    charlie used his cell phone for a total of 1216 minutes in one month. if he talked the same number of minutes each day, what is the best estimate for his daliy minute usage?
  7. math

    6. If each of eight biology classrooms is in use for 5 hours and 15 minutes per day, and total of 84 student experiments are done, how long does each experiment take on average?
  8. math

    Jim can fill a pool carrying buckets of water in 30 minutes. Sue can do the same job in 45 minutes. Tony can do the same job in 1.5 hours. How quickly can all three fill the pool together?
  9. Physical Science

    Here are some half-lives for different isotopes of bismuth (Bi): Bi-211 — 2.1 minutes Bi-212 — 60.6 minutes Bi-213 — 45.7 minutes Bi-214 — 19.9 minutes If there are 200 grams of one isotope of bismuth, and after 60.6 minutes …
  10. Chemistry

    How much of a 50.0 grams sample of Uranium-238 would remain after 26 minutes IF the half-live is 13.0 minutes?

More Similar Questions