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

kayla's class went on a field trip to an aquarium . one tank had 30 clown fish. She miscounted the total number of clown fish in the tank and recorded it as 24
divide $70 into 1:2:4
suppose you are testing how the number of battries affects bulb brightness. What heads would you use on this data table?
Which weighs more 2.5 pounds of rocks or 40 ounces of feathers
7. The Preamble of the Constitution of the United States clearly states that the source of governmental authority is which of the following? Local governments
How many Ukrainians died in world war 1?
what is 73/9 as a mixed number
Which of the following resources is a nonrenewable resource? A.) Gold B.) Carbon C.) Tree D.) River
is 2/5 larger than 2/7? (Fractions)
If similar fossil collections are found on two continents, now widely separated, what is a possible explanation