3 years ago

Please help and explain how to do it need the answer asap, please.

Chemistry

1 answer:

dimulka [17.4K]3 years ago

8 0

Answer:

45 and 20 c2 Or4

Explanation:

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$Average\ atomic\ mass=(\frac {\%\ of\ the\ first\ isotope}{100}\times {Mass\ of\ the\ first\ isotope})+(\frac {\%\ of\ the\ second\ isotope}{100}\times {Mass\ of\ the\ second\ isotope})+(\frac {\%\ of\ the\ third\ isotope}{100}\times {Mass\ of\ the\ third\ isotope})$

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