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

Use this figure to find the value of ∠FOD.
A lot of companies have unnecessary rules just because they want to control people
Factor (x-1)^3 (4x-9) - (16x+9) (x+1)^2 ? Please explain steps, I'm stuck !
Really need help with number nine thank you :))
Consider this passage: "'Either we'll finish the yard work in time to go to the movie, or we'll enjoy a quiet evening at home,' said John. 'I don't see us finis
Difference between erythema multiforme and stevens johnson
What is the volume of the figure below?
What charteristics are common to all to all plants and animals
"Isn't she—a pretty girl, any more?" "Isn't she—a pretty girl, any more?" "Oh, she's all right." "Look here," said Dexter, sitting down suddenly, "I don't und
Need some help with this question in this picture please