4 years ago

Which energy changes in the enthalpy of solution are endothermic, and which are exothermic?

1 answer:

8 0

When energy is needed in order for the reaction to happen, then that reaction is known as endotermic. When the reaction has as a result energy then it is exotermic. An example of an endotermic reaction would be photosynthesis, for an exotermic: combustion.

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the specific heat of iron is 0.4494 j/g°C. how much heat energy (kj) is transferred when a 24.7 kg iron ingot is cooled from 880

guapka [62]

Answer is: 9623.85 kJ of heat is transferred from iron ingot.
m(Fe) = 24.7 kg · 1000 g/kg = 24700 g; mass of iron ingot.
C = 0.4494 J/g°C; the specific heat of iron
ΔT = 880°C - 13°C; temperature difference.
ΔT = 867°C.
Q = m·C·ΔT.
Q = 24700 g · 0.4494 J/g°C ·867°C.
Q = 9623856.06 J ÷ 1000J/kJ.
Q = 9623.85 kJ.

8 0

4 years ago

Analysis of a volatile liquid shows that it contains 48.64% carbon, 8.164% hydrogen, and 43.20% oxygen by mass. at 150.°c and 1.

Brut [27]

Hope this helps.....