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For producing 4 gram moles of HNO3, how many grams of NO2 are required?

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For producing 4 gram moles of HNO3, how many grams of NO2 are required?

(a) 274

(b) 275

(c) 276

(d) 277

I got this question by my college director while I was bunking the class.

Query is from Stoichiometry-III topic in chapter Material Balances without Reaction and Material Balances Involving Reactions of Chemical Process Calculation

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Correct answer is (c) 276

The explanation: 3 gram mole of NO2 = 2 gram moles of HNO3.

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