Question

Half life period of first orderreaction is 20 minutes, how long will it take to 75% completion

Answer 1

☆☆AS-SALAMUALAIKUM ☆☆

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▪N =100% of that substance

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▪after first half life it will remain 50% I.e N/2 ,time =20minutes for first half life

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▪after a second half life it will remain half of N/2 I.e 1/2×N/2=N/4 ,time =20minutes for second half life

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▪so it takes 20+20=40minutes for 75%completion

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♡♤♡ INSHALLAH IT WILL HELP U ♤♡♤

Answer 2

If 50%in 20min then 25%in 10 min.   75=50+25  20min+10min=30minutes   If it helps you then please mark it as brainliest