LaurindaDelrosario LaurindaDelrosario

03-06-2015
Chemistry

Answered

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

Answer :

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

Other Questions

which of the following rational functions is graphed below?

The image shows an example of a note-taking method. Which method is this? outlining charting Cornell mapping

• Determina a partir del esquema la distancia rec da, E=mc² desplazamiento, la velocidad media y la rapidez.edia de las siguientes trayectorias: en 120 s. пол B

Use the Murphy map to answer the questions related to the topographic map. What is the latitutde reading of the northern line of the map? a) 84º 7' 30" Nb) 35°

Which of the following refers to a form of government payment to a producer? a) Currency control b) Import quota c) Subsidy d) VER Export financing

Question 13 (Mandatory) (1 point) A dual in-line package (DIP) has two parallel rows of pins; the standard spacing between pins in one row is a) 0.6" (600 mil)

ano-ano ang mga hanapbuhay ng sketching outlining at shading (10 items)

Find the sum of the sequence: sum from k=1 to 16 of 2?

Select the correct answer. Two events, E1 and E2, are defined for a random experiment. Which equation represents the condition that the events are nonexclusive?

1 2 3 4 5 678010 President Carter's stimulus plans O improved economic growth. O did not improve economic growth. were widely successful. were not implemented.