Question

A 10 gram sample of a substance that's used to detect explosives has a k-value of 0.1353.
Find the subtance's half-life, in days.round to the nearest hundreds

Answer 1

you shoud try to ask it in chemistry section

Answer 2

ok thanks it scause i really need this answer

Answer 3

do you have the formula?

Answer 4

n=Noe^kt

Answer 5

n is moles?

Answer 6

i need to round to the nearest hundreds too

Answer 7

what is the unity of k?

Answer 8

What does k represent?

Answer 9

a positive constant that depends on the substance itself and on the units used to measure time

Answer 10

5=10*e^(Kt), but what unity of time? seconds^-1?

Answer 11

Its in days

Answer 12

there a picture of the question

Answer 13

and probally the formula is e^(-kt)

Answer 14

did you see the picture

Answer 15

ya its a diff question :)

Answer 16

my bad ill got teh wrong one

Answer 17

if k is in days^-1 just solve 5=10*e^(-kt), and you will find t

Answer 18

but i dont know how to solve it either -.-

Answer 19

can you help me please i really need it

Answer 20

ok