when 1.0 mol of NO(g) forms from its elements, 90.29 kJ of heat is absorbed. How...

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when 1.0 mol of NO(g) forms from its elements, 90.29 kJ of heatis absorbed. How much heat is evolved when 5.40 g of NO decomposesto its elements?

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4.2 Ratings (675 Votes)

Molar mass of NO = At.mass of N + At.mass of O = 14+16=30 g/mol

Given The amount of heat absorbed for the formation of 1 mol=30 g of NO is 90.29 kJ

So the amount of heat absorbed for the formation of 5.40 g of NO is = ( 5.40x90.29) / 30

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 16.25 kJ

This the the absorbed amount of heat

So for the decomposition of NO the heat is evolved & this is the reverse of the above value

The amount of heat evolved when 5.40 g of NO decomposes to its elements is 16.25 kJ

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