How much heat energy is gained when 5kg of water at 20^(@)C is brought to its boiling point (Specific heat of water = 4.2 kJ kg^(-1^(@))C^(-1)

How much heat energy is gained when 5kg of water at 20^(@)C is brought

1.	How much heat energy is gained when 5kg of water at 20^(@)C is brought to its boiling point (Specific heat of water = 4.2 kJ kg^(-1^(@))C^(-1)
Answer» <html><body><p></p>Solution :`Q _(<a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a>) = mcd T + mL = 2000 xx 1 xx 25 + 2000 xx 80 = 2.1 xx 10 ^(<a href="https://interviewquestions.tuteehub.com/tag/5-319454" style="font-weight:bold;" target="_blank" title="Click to know more about 5">5</a>) cal. Q _(1) = Q _(2) T _(1) //T_(2)` <br/> `Q _(1) = 2.1 xx 10 ^(5) xx 298 // 258 = 2.42 xx 10 ^(5) cal. ` Energy needed `= Q _(1) - Q _(2) = 3.25 xx 10 ^(<a href="https://interviewquestions.tuteehub.com/tag/4-311707" style="font-weight:bold;" target="_blank" title="Click to know more about 4">4</a>) cal= 3.25 xx 10 ^(4) xx 4.2 //3600 = 37.92 Wh.`</body></html>