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12345 [234]
3 years ago
15

If 115grams of a substance reacts with 84grams of another substance, what will be the mass of the products after the reaction?

Chemistry
1 answer:
AysviL [449]3 years ago
4 0
Isn’t it 115+84 so 199
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If nitrogen-13 has a half life of 2.5 years, how much remains from a 100g sample after 7.5 years
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Answer:

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Explanation:

T½ = 2.5years

No = 100g

N = ?

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To solve this question, we'll have to find the disintegration constant λ first

T½ = In2 / λ

T½ = 0.693 / λ

λ = 0.693 / 2.5

λ = 0.2772

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N = 100*e^-2.079

N = 100 * 0.125

N = 12.50g

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