LaurindaDelrosario
LaurindaDelrosario LaurindaDelrosario
  • 03-06-2015
  • Chemistry
contestada

What is the half-life of sodium-25 if 1.00 gram of a 16.00-gram sample of sodium-25 remains unchanged after 237 seconds?
(1) 47.4 s (3) 79.0 s
(2) 59.3 s (4) 118 s

Respuesta :

rabinshrestha41
rabinshrestha41 rabinshrestha41
  • 03-06-2015
Given,
1 gram remain out of 16 grams after 237 seconds.

So, 
1g -> 2g -> 4g -> 8g -> 16g
So, 4 half lives have taken palce.

So,
we divide 237 by 4 and we get our answer.

So,
234 / 4 = 59.25 ≈ 59.3

So, the answer is (2) 59.3 seconds
Answer Link

Otras preguntas

write a letter to your younger brother telling him about your studies at hostel and your daily routine there. you are sakshi/ rohit.​
8a-4(-5a-2)=12a solve please!!!
The area of a square is 36. A rectangle whose length is 1 more than twice its width has the same area. What are the dimensions of the rectangle?
Write an appropriate goodbye expression for each of the following situations
Write -70.075 as a mixed number.
what represents “3 more than x”
Pretty please help!!! Will mark brainiest!! One day, the ticket-selling employees forgot to count how many people came to the park. Using the inverse function (
Which statements explain why rocks weather at different rates
How do idols and the social media influence the way we live ?
You purchase a new car (produced this year) for $38,000. After six months, you sell the car for $31,500. How much does GDP rise because of these two transaction