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Question

2 gram of ice at zero degree celsius is mixed with 1 gram of steam at hundred degree Celsius find the temperature of the mixture.and also why we are getting 3g of H20in this problem.please explain

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Solution

Answer : 100°C Mixture Temperature

I am also going to assume that you have knowledge of

  1. latent heat of fusion and vaporization
  2. specific heat capacity
  3. Specific heat capacity of ice, water and steam are different.
Latent heat of fusion require to change ice into water without changing temperature

Latent heat of vapourization require to change water into heat without changing temperature

Specific heat of water require to change temperature of water


Latent Heat of fusion to change ice into water


Heat required to melt 1 g of ice of 0C to water at 0C = 1 × 80 cal.

Heat required to melt 2 g of ice of 0C to water at 0C = 2 × 80 cal = 160 cal

Now we have 2gm of water at 0C

Heat required to raise temperature of 1 g of water from 0C to 100C = 1 × 1 × 100 = 100 cal

Heat required to raise temperature of 2 g of water from 0C to 100C = 2 × 1 × 100 = 200 cal

Nowwe have 2gm of water at 100C

Total heat required by 2 gm of ice to attain maximum temperature of 100 = 160 + 200 = 360 cal

To supply this heat steam will convert into water and release latent heat of vapourisation.

1 gm steam when converted into water at 100°C release heat = 540 cal

So 2/3 gm steam when converted into water at 100°C will release heat = 360 cal

Hence final temperature of the mixture will be 100°C

Total water present = 2+2/3 gm = 2.67 gm at (100°C)

Total steam present = 1/3 gm =0 .33 gm at (100°C)

I do not know how you got 3 gm of water

If initially 3 gm of ice will be present

Than heat require will be 540 cal and full 1gm steam will be converted into water and finally you will get total water present = 3gm


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