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JAMB Chemistry 2020 Paper

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Question : 25

Total: 40

32g of anhydrous copper(ii)tetraoxosulphate(vi) dissolved in 1dm

^3

of water generated 13.0kj of heat. The heat solution is?

26.0kj/mol
65.0kj/mol
130.0kj/mol
260.0kj/mol

Solution:

32g of CUSO $_4$ liberate 13.0kj of heat

Molar mass of CUSO $_4$ = 160g

No. of moles of CUSO $_4$ = 32g

No. of moles = 32(mass) / 160(molar mass)

= 0.2 moles

i.e 0.2 = 13kj

1 moles = xkj

: 65KJ

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