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

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

How many prepositional phrases are in the sentence below? Buried deep in the sand near the rotting hull of an old schooner, there lay a chest full of gold. Sel

(99 Points) In the Position versus Time Graph of an object moving in a straight line, does the graph show acceleration during the interval from time equals two

Calculate the molar mass of an unknown if a solution containing 3.56 g of unknown in 56.2 g of water froze at –1.60c

In 1845, new york journalist and armchair expansionist john l. o'sullivan coined the term manifest destiny, by which he meant that

European powers met at the 1884 Berlin Conference in order to:

Someone help me please

which equation has the same solution as 4-2(x-5)=x-19

Helppppppppppppppppppp

Changes in u.s. society, including __________, have led to a surge in the importance of pr in our society.

In a home for troubled youth, adolescents receive large colored buttons when they hang up their clothes, make their beds, and come to meals on time. the adolesc