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

if the slope of a position versus time graph is downward what kind of motion produced the graph
What does this mean?The levying money for or to use of the crown by pretense of prerogative,without grant of parliament, for long time, or in other manner than
what are three physical properties of aluminum foil
what evidence shows that sumerians where not prehistoric
Does the equator cross the northern or southern part of South America? South America is located mostly in which two hemispheres?
Sam evaluated the expression x2y for x = 7 and y = 9. He got a value of 49. Which of the following statements is correct
Estimate each quotient using compatible numbers.
How would you describe the human features of a place?
what is the proper or common noun in this sentence?The picture below is of the snow Festival in Sapporo.
How do I change 36 to 360