Question

Will fan and medal if you answer right
The rate law for a hypothetical reaction is rate = k [A]2. When the concentration is 0.10 moles/liter, the rate is 2.7 × 10-5 M*s-1. What is the value of k?

2.7 × 10-3

2.7 × 10-3 M-1s-1

7.2 × 105 M-1s-1

2.7 × 10-4 M-1s-1

Answer 1

plug in 2.7 * 10^-5 for rate, and 0.1 for A, then solve for k

Answer 2

I got 2.7 8 10^-6

Answer 3

Which is not even in the answer choice

Answer 4

check your math again...

Answer 5

(2.7*10^-5)/(0.1^2) = ?

Answer 6

No Clue. I'm NOT this advanced in math yet

Answer 7

oki let me try

Answer 8

i got .0027, idk anymore

Answer 9

right, 0.0027, now convert to scientific notation

Answer 10

how do you convert to scientific notation on calculator

Answer 11

uh, I'm not sure you can do that on a calculator

0.0027 = 2.7 * 10 ^ x
find x

Answer 12

10^-4

Answer 13

?

Answer 14

not quite, try again...

how many places do you have to move the decimal point to get from
0.0027 to 2.7?

Answer 15

3

Answer 16

right! so, 0.0027 = 2.7 * 10^(-3)

now, the units of k are M-1s-1

so our answer becomes 2.7 * 10^(-3) M-1s-1

Answer 17

Thank you