Home › Maharashtra SSC (Class 10) › Physics › Heat › The specific latent heat of fusion of ice is 80 …
The specific latent heat of fusion of ice is 80 cal/g. How much heat is needed to completely melt 50 g of ice already at 0 °C into water at 0 °C?
A1600 cal
B400 cal
C4000 cal
D27000 cal
Answer & Solution
Correct answer: C. 4000 cal
1. Heat for melting: $Q = m \times L_{melt}$.
2. Since the ice is already at 0 °C, no sensible heat is needed first.
3. Substitute: $Q = 50\ \text{g} \times 80\ \text{cal/g}$.
4. $Q = 4000\ \text{cal}$.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 5 "Heat", p.72_
Related questions
A calorimeter of mass 100 g (specific heat 0.1 cal/g °C) contains 250 g of liquid at 30 °CTo convert 2 kg of water at 20 °C into ice at 0 °C, liquid ammonia is evaporated. Given spA thermally insulated pot holds 150 g of ice at 0 °C. How much steam at 100 °C must be add80 g of steam at 97 °C is released onto an ice slab at 0 °C. Using L(vap) = 540 cal/g, speA copper sphere of mass 100 g at 100 °C is dropped into 195 g of water at 20 °C held in a Going by the calorie definition, the heat needed to raise the temperature of 1 kg of waterIn Hope's apparatus, when water is cooled by the freezing mixture, the lower thermometer THow much heat must be supplied to convert 10 g of ice at 0 °C into water at 50 °C? (Latent