ile ciepla potrzeba dostarczyc' aby stopic 1 kg lodu o temperaturze 0 stopni C ?
oraz ile energii trzeba dostarczyc do wrzenia 2 kg lodu?
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m₁ = 1 kg
m₂ = 2 kg
ct = 334000 J/kg
T₁ = 0⁰C
T₂ = 100⁰ C
cw = 4200 J/kg * ⁰C
Q = ?
Q₁ = m * ct
Q₁ = 1 kg * 334000 J/kg = 334000 J = 334 kJ
Q₂ = m₂ *ct
Q₂ = 2 kg *334000 J/kg
Q₂ = 668000 J = 668 kJ
Q₃ = m * cw*Δ T
Q₃ = 2 kg * 4200 J/kg * ⁰C * ( 100⁰ C - 0⁰C )
Q₃ = 840000 J = 840kJ
Q = Q₂ + Q₃
Q = 1508 kJ
1 kJ = 1000 J