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whosdarrin9396
18.01.2021 •
Chemistry
Heat required to convert 2 g ice at -20°C into water at 20°C is (Specific
heat of ice 0.5 cal g-1 °C-1, latent heat of fusion of ice 80 cal g )
-20°C वाली 2 g बर्फ को 20°C वाले जल में रूपान्तरित करने में आवश्यक ऊष्मा है (बर्फ
की विशिष्ट ऊष्मा 0.5 cal g-1 °C-1 है, बर्फ के संलयन की गुप्त ऊष्मा 80 calg)
A
220 joule
220 जूल
220cal
100cal
22cal
Solved
Show answers
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Ответ:
Heat required = 220 cal
Further explanationGiven
2 g ice at -20°C into water at 20°C
c ice = 0.5 cal g-1 °C-1
Lf = 80 cal/g
Required
Heat
Solution
The heat needed to raise the temperature
Q = m . c . Δt
1. heat to raise temperature from -20 °C to 0 °C
Q = 2 x 0.5 x 20
Q = 20 cal
2. phase change(ice to water)
Q = m.Lf
Q = 2 . 80 cal/g
Q = 160 cal
3. heat to raise temperature from 0 °C to 20 °C ( c water = 1 cal/g.C)
Q = 2 . 1 . 20
Q = 40 cal
Total heat = 220 cal
Ответ:
Explanation:
KOH +HBr = KBr + H2O
The equation is balanced since all the molecules are equal..