A test of an automobile engine’s exhaust revealed that 3.5 g of NO2 was emitted in 10. minutes of operation. How many moles of NO2 would this engine release if it were used for a 40.-minute commute, assuming that this measured number is representative of the emission under all circumstances?

0.304 moles of NO₂ may be produced

Explanation:

During 10 minutes of operation, 3.5 g of NO₂ were produced by the engine.

In 40 minutes, the engine may produce (40 . 3.5)/ 10 = 14 g of gas

Solved by a rule of three.

Let's convert the mass to moles → 14 g . 1 mol/ 46 g = 0.304 moles

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