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Which of the following substances is in its standard state at 25∘C? Select the correct answer...

Which of the following substances is in its standard state at 25∘C?

Select the correct answer below:

A. CO2(g) at 1atm

B. C(s) diamond at 1atm

C. CO(s) at 1atm

D. C2H4(s) at 1atm

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