if 2g is allowed to decpompose for 42 min, the mass remaining undecomposed is found to be .5g what is the half life?
Starting with 2g of A, what is the mass of it remaining undecomposed after an hour?
half life question help?
2009-05-20 4:40 am
回答 (2)
2009-05-20 5:02 am
✔ 最佳答案
The half life is 21 minutes:2g at 0 minutes
1g at 21 minutes
.5g at 42 minutes.
.25 at 63 minutes
2009-05-20 12:00 pm
half of 2.0g is 1.0g and half of that amount is .5g. So, divide 42 by 2 and you will know the half life of 2g. The half life is 21 minutes.
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