If a sample contains 25 g or carbon-14 and 75 g of nitrogen-14, how many half-lives has it undergone

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1. If a sample contains 70g of Carbon 14 and 70g of Nitrogen 14, how many half lives has it undergone? (show all of your work)
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2. If a sample contains 50g of carbon 14 and 50g of nitrogen 14 , how many lives has it undergone ?
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3. The half-life of carbon 14 is 5730 years. if a 1 g sample of old carbon is 1/8 as radioactive as 1 g of a current sample, then
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4. A radioisotope has a half-life of 7.5 hours. How many half lives have occured after 67.5 hours?a. 7 half-lives b. 8 half-lives
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