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I am Lyosha [343]
3 years ago
5

Which statements best describe half-lives of radioactive isotopes? Check all that apply.

Chemistry
2 answers:
AURORKA [14]3 years ago
5 0

Answer: The half-life varies depending on the isotope.  Half-lives range from fractions of a second to billions of years.   The half-life of a particular isotope is constant.  

Explanation: On Edgenuity!!!!

Igoryamba3 years ago
3 0

Answer:

The half-life varies depending on the isotope.

Half-lives range from fractions of a second to billions of years.

The half-life of a particular isotope is constant.

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Answer:

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Explanation:

The reaction between CO and O₂ is the following:

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We balance the equation with a coefficient 2 in CO and CO₂ to obtain the same number of O atoms:

2CO + O₂ → 2CO₂

As we can see from the balanced equation, 1 mol of O₂ is required to react with 2 moles of CO. Thus, the conversion factor is 1 mol of O₂/2 mol CO. We multiply the moles of CO by the conversion factor to calculate the moles of O₂ that are required:

28 mol CO x 1 mol of O₂/2 mol CO = 14 mol O₂

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