Question

In a large building, oil is used in a steam boiler heating system. The combustion of...

In a large building, oil is used in a steam boiler heating system. The combustion of 1.0-lb of oil provides 2.4×107J.

How many kilograms of oil are needed to change 190 kg of water to steam at 100 ∘C?

Express your answer to two significant figures and include the appropriate units.

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Answer #1

n a large building, oil is used in a steam boiler heating system. The combustion of 1.0-lb of oil provides 2.4×107J.

How many kilograms of oil are needed to change 190 kg of water to steam at 100 ∘C?

during conversion of water to steam at 100 deg.c, latent heat has to be supplied and this latent heat= mass of water* heat of vaporization = 190Kg* 2260 Kj/kg = 429400 KJ

1 lb=0.4535 kg of oil produces 2.4*107 J or 2.4*107/1000 Kj or 2.4*104 KJ

2.4*104 KJ is produced from 0.4535 kg of oil

429400 Kj is produced from 429400*0.4535/ (2.4*104)= 8.11 kg

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