#how do you subtract two scientific notations ?

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hearty charm
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3 × 10²³ - 1.2 × 10¹⁰ ?

strong spireBOT
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rustic oar
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Factor the gcf out

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However for your specific question it'd still just be 3E23 since that's significantly larger than 1.2E10

trail dragon
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Though, in this case, the result will barely be different from 3*10^23. You'll need about 14 significant digits to see the difference, which is highly unlikely in an experiment.

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3*10^23... That's pretty close to (1/2)N_A.

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Well, if we discount the mol^(-1).

hearty charm
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Thank you for helping

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It really helped me clear my doubt