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Tentukan Besar Energi Kalor Yang Diperlukan Untuk Proses B - D Berikut

Safrin

18 May, 2022

Besarnya Energi Kalor Yang Diperlukan Untuk Proses B - D - Pada artikel kali admin akan membahas tentang kalor dalam penerapan soal yang disertai dengan pembahasan dan kunci jawaban. Untuk lebih jelasnya silahkan simak artikel ini sampai selesai.

Soal

Perhatikan grafik di bawah ini !

Sebongkah es memiliki massa 0,5 kg, jika kalor jenis es 0,5 kkal/kg⁰C, kalor lebur es 80 kkal/kg dan kalor jenis air 1 kkal/kg⁰C maka kalor yang diperlukan pada proses B - D adalah ....

A. 65 kkal

B. 2,5 kkal

C. 67,5 kkal

D. 40 kkal

Pembahasan dan Jawaban

Penyelesaian

Diketahui:

m_es = 0,5 kg

c_es = 0,05 kkal/kg⁰C

c_air = 1 kkal/kg⁰C

L_es = 80 kkal/kg

∆T = 50 ⁰C

Ditanyakan : Q_B-D = ..........?

Jawab

Q_A-D = Q_B-C + Q_B-D

Dari proses B ke C merupakan proses peleburan, maka rumus yang digunakan adalah sebagai beriku:

Q_B-C = m_es. L_es

Q_B-C = 0,5 kg . 80 kkal/kg

Q_B-C = 40 kkal

Jadi nilai Q_B-C adalah 40 kkal.

Dari proses C ke D merupakan proses perubahan suhu, dengan menggunakan rumus sebagai berikut :

Q_C-D = m_es. c_air. ∆T

Q_C-D = 0,5 kg . 1 kkal/kg⁰C. 50⁰C

Q_C-D = 25 kkal

Jadi nilai Q_C-D adalah 25 kkal.

Jadi kalor yang dibutuhkan dari B ke D adalah 65 kkal.

Jawaban. A

Safrin

Seorang guru SMP yang ingin berbagi informasi seputar dunia pendidikan dari sumber yang relevan

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