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

Food assessment answer test
the half-life of carbon-14 is 5,730 years. After 11,460 year, how much of original carbon-14 remains?
Which research question would LIKELY fit the comparison and contrast organizational method? A) What is the Emancipation Proclamation? B) How many American docum
Which pair of complex factors results in a real number product? 15(–15i) 3i(1 – 3i) (8 + 20i)(–8 – 20i) (4 + 7i)(4 – 7i)
A group of students is investigating how the addition of salt impacts the floatation of an egg in water. Four identical cups were taken for the experiment. The
Germany ,austro-Hungary and Italy before wwI
What writing process do you use when you are assigned an essay or paper
Find Q in this equation 2/3Q+5=2Q+13
The wife of a man who is dying tells the nurse: "harold was so good to me. he was like a saint with his patience. i will miss him terribly" which stage of grief
read the sentence. marcus threw the baseball to his teammate. which BEST identifies the voice of the verb in this sentence? A)subjunctive B)passive voice C)acti