Berapa kalor yang diperlukan agar 5 kg es pada -20°C menjadi uap air seluruhnya pada 120°C?

Pertanyaan

Berapa kalor yang diperlukan agar 5 kg es pada -20°C menjadi uap air seluruhnya pada 120°C?space space 

N. Puspita

Master Teacher

Jawaban terverifikasi

Pembahasan

Penyelesaian:

Diketahui:

table attributes columnalign right center left columnspacing 0px end attributes row cell m subscript e s end subscript end cell equals cell 5 space kg end cell row cell T subscript e s end subscript end cell equals cell negative 20 to the power of straight omicron straight C end cell row cell T subscript u a p space a i r end subscript end cell equals cell 120 to the power of straight omicron straight C end cell row cell straight c subscript es end cell equals cell 2100 space straight J divided by kg to the power of straight omicron straight C end cell row cell c subscript a i r end subscript end cell equals cell 4200 space straight J divided by kg to the power of straight omicron straight C end cell row cell c subscript u a p space a i r end subscript end cell equals cell 2010 space straight J divided by kg to the power of straight omicron straight C end cell row U equals cell 2260000 space straight J divided by kg end cell row cell L subscript e s end subscript end cell equals cell 336000 space straight J divided by kg end cell end table

Ditanya: Q total ?

Jawab:

Q dari es suhu negative 20 to the power of straight omicron straight C menjadi es suhu 0 to the power of straight omicron straight C adalah

table attributes columnalign right center left columnspacing 0px end attributes row cell Q subscript 1 end cell equals cell m cross times c subscript e s end subscript cross times increment T end cell row blank equals cell 5 cross times 2100 cross times open parentheses 20 minus 0 close parentheses end cell row blank equals cell 5 cross times 2100 cross times 20 end cell row blank equals cell 210000 space straight J end cell row blank equals cell 210 space KJ end cell row blank blank blank end table

Q dari es suhu 0 to the power of straight omicron straight C menjadi air suhu 0 to the power of straight omicron straight C adalah

table attributes columnalign right center left columnspacing 0px end attributes row cell Q subscript 2 end cell equals cell m cross times L subscript e s end subscript end cell row blank equals cell 5 cross times 336000 end cell row blank equals cell 1680000 space straight J end cell row blank equals cell 1680 space KJ end cell row blank blank blank end table

Q dari air suhu 0 to the power of straight omicron straight C menjadi air suhu 100 to the power of straight omicron straight C adalah

table attributes columnalign right center left columnspacing 0px end attributes row cell Q subscript 3 end cell equals cell m cross times c subscript a i r end subscript cross times increment T end cell row blank equals cell 5 cross times 4200 cross times open parentheses 100 minus 0 close parentheses end cell row blank equals cell 2100000 space straight J end cell row blank equals cell 2100 space KJ end cell row blank blank blank end table

Q dari air suhu 100 to the power of straight omicron straight C menjadi Uap air suhu 100 to the power of straight omicron straight C adalah

table attributes columnalign right center left columnspacing 0px end attributes row cell Q subscript 4 end cell equals cell m cross times U end cell row blank equals cell 5 cross times 2260000 end cell row blank equals cell 11300000 space straight J end cell row blank equals cell 11300 space KJ end cell row blank blank blank end table

Q dari Uap air suhu 100 to the power of straight omicron straight C menjadi Uap air suhu 120 to the power of straight omicron straight C adalah

table attributes columnalign right center left columnspacing 0px end attributes row cell Q subscript 5 end cell equals cell m cross times c subscript u a p space a i r end subscript cross times increment T end cell row blank equals cell 5 cross times 2010 cross times open parentheses 120 minus 100 close parentheses end cell row blank equals cell 201000 space straight J end cell row blank equals cell 201 space KJ end cell row blank blank blank end table

table attributes columnalign right center left columnspacing 0px end attributes row cell Q subscript t o t a l end subscript end cell equals cell Q subscript 1 plus Q subscript 2 plus Q subscript 3 plus Q subscript 4 plus Q subscript 5 end cell row blank equals cell open parentheses 210 plus 1680 plus 2100 plus 11300 plus 201 close parentheses space KJ end cell row cell Q subscript t o t a l end subscript end cell equals cell 15491 space KJ end cell end table

Jadi kalor total yang dibutuhkan dalam semua proses di atas adalah 15491 KJ.

 

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Kalor yang digunakan untuk mengubah wujud zat memenuhi rumus: Q=............... Pada saat wujudnya berubah maka suhu zat akan .............. .

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