JUST TELL ME WHERE DOES THE \"53\" COMESFROM

Question

problem:What mass of acrylonitrile can beprepared? Acrylonitrile is an important building block for synthetic fibersand plastics. Over 2 billion pounds of acrylonitrile are producedin the United States each year. The compound is synthesized frompropene in the following reaction:

2C3H6 + 2NH3 + 3O2 -> 2C3H3N + 6H2O

What mass of acrylonitrile can be prepared from 200.0 kg ofpropene, 300.0 kg of ammonia, and 350.0 kg of oxygen?
SOLUTION:
200,000 g propene x 1 mol / 42 g = 4762 mol === 4762 molacrylonitrile
300,000 g NH3 x 1 mol / 17 g = 17647 mol === 17647 molacrylonitrile
350,000 g O2 x 1 mol / 32 g = 10938 mol === 7292 molacrylonitrile

So propene is limiting, and

4762 mol acrylonitrile x 53g / mol = 252 kg

Explanation / Answer

The question asks for the mass of acrylonitrile # of mol acrylonitrile x molar massacrylonitrile = total mass ofacrylonitrile 53g/mol is the molar mass of acrylonitrile(C3H3N = 12x3 + 1x3 + 14 = 53g)

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