Omg hard chemistry problem?

[Sum]

In 5.49 seconds, 1.20g of argon-35 decay to leave only 0.15g. What is the half-life of argon-35?

 

[lucas c]

Everytime a half-life passes, exactly one-half of the previous amount remains. How many half-lifes must pass in order for 1.20 grams of Ar-35 to decay to 0.15 grams?

After 1 half-life, 0.60 grams remain.
After 2 half-lifes, 0.30 grams remain.
After 3 half-lifes, 0.15 grams remain.

So three half-lifes pass in 5.49 seconds. That means the half-life is 5.49 seconds divided by 3, or 1.83 seconds.

I hope that helps. Good luck!

 

[lucas c]

Everytime a half-life passes, exactly one-half of the previous amount remains. How many half-lifes must pass in order for 1.20 grams of Ar-35 to decay to 0.15 grams?

After 1 half-life, 0.60 grams remain.
After 2 half-lifes, 0.30 grams remain.
After 3 half-lifes, 0.15 grams remain.

So three half-lifes pass in 5.49 seconds. That means the half-life is 5.49 seconds divided by 3, or 1.83 seconds.

I hope that helps. Good luck!

 

[lucas c]

Everytime a half-life passes, exactly one-half of the previous amount remains. How many half-lifes must pass in order for 1.20 grams of Ar-35 to decay to 0.15 grams?

After 1 half-life, 0.60 grams remain.
After 2 half-lifes, 0.30 grams remain.
After 3 half-lifes, 0.15 grams remain.

So three half-lifes pass in 5.49 seconds. That means the half-life is 5.49 seconds divided by 3, or 1.83 seconds.

I hope that helps. Good luck!

 

[lucas c]

Everytime a half-life passes, exactly one-half of the previous amount remains. How many half-lifes must pass in order for 1.20 grams of Ar-35 to decay to 0.15 grams?

After 1 half-life, 0.60 grams remain.
After 2 half-lifes, 0.30 grams remain.
After 3 half-lifes, 0.15 grams remain.

So three half-lifes pass in 5.49 seconds. That means the half-life is 5.49 seconds divided by 3, or 1.83 seconds.

I hope that helps. Good luck!

 

[lucas c]

Everytime a half-life passes, exactly one-half of the previous amount remains. How many half-lifes must pass in order for 1.20 grams of Ar-35 to decay to 0.15 grams?

After 1 half-life, 0.60 grams remain.
After 2 half-lifes, 0.30 grams remain.
After 3 half-lifes, 0.15 grams remain.

So three half-lifes pass in 5.49 seconds. That means the half-life is 5.49 seconds divided by 3, or 1.83 seconds.

I hope that helps. Good luck!

 

[lucas c]

Everytime a half-life passes, exactly one-half of the previous amount remains. How many half-lifes must pass in order for 1.20 grams of Ar-35 to decay to 0.15 grams?

After 1 half-life, 0.60 grams remain.
After 2 half-lifes, 0.30 grams remain.
After 3 half-lifes, 0.15 grams remain.

So three half-lifes pass in 5.49 seconds. That means the half-life is 5.49 seconds divided by 3, or 1.83 seconds.

I hope that helps. Good luck!