The average weighted atomic mass of magnesium is 24.305 amu. If the percent abundance of Mg-22 with an atomic mass of 22.445 amu is 18.30%, what is the atomic mass of the other isotope that is most common in nature?

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water pollution kills aquatic life. aquatic life includes algae and other plant life that use photosynthesis. photosynthesis takes   c02 out of the air.  

c02is a greenhouse gas.

they both have a y in them

i just calculated it all out, and not including weekends, and all the different days off. as of this school year (2018-2019) students are spending 2198 hours in school this year

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.