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In a batch process, 40 mole of O2 and 30 mole of CO2 entered a vessel with some CO2, if 100 mole of product leaves the vessel, what is the percentage of O2 in the product?

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In a batch process, 40 mole of O2 and 30 mole of CO2 entered a vessel with some CO2, if 100 mole of product leaves the vessel, what is the percentage of O2 in the product?

(a) 10%

(b) 40%

(c) 60%

(d) 80%

The question was asked in exam.

I'd like to ask this question from Material Balances for Batch and Semi-Batch Processes topic in chapter Introduction to Material Balances of Basic Chemical Engineering

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Right option is (b) 40%

Explanation: Percentage of H2O in the product = 40/100*100 = 40%.

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