Home
Class 11
CHEMISTRY
Calculate the amount of heat necessary t...

Calculate the amount of heat necessary to raise 180 g of water from `25^@C` to `100^@C` . Molar heat capacity of water is `75.3 "J mol"^(-1) K^(-1)`

Text Solution

Verified by Experts

Given : Number of moles of water `n=(180 g)/(18 g "mol"^(-1))=10` mol molar heat capacity of water
`C_P=75.3 J K^(-1) "mol"^(-1)`
`T_2=100^@C`=373 K
`T_1=25^@C` =298 K
`DeltaH`=?
`DeltaH=nC_P (T_2-T_1)`
`DeltaH="10 mol" xx "75.3 J mol"^(-1) K ^(-1) xx(373-298)K`
`DeltaH`=56475 J
`DeltaH` =56.475 kJ
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS

    FULL MARKS|Exercise Additional Questions Solved (I)|39 Videos

  • THERMODYNAMICS

    FULL MARKS|Exercise Additional Questions Solved (II)|3 Videos

  • THERMODYNAMICS

    FULL MARKS|Exercise Textual Question Solved|46 Videos

  • SOLVED PAPER 13 (UNSOLVED)

    FULL MARKS|Exercise PART-II|9 Videos

Similar Questions

Explore conceptually related problems

Calculate the heat energy required to raise the temperature of 2 kg of water from 10^@C to 50^@C . Specific heat capacity of water is 4200 JKg^(-1) K^(-1)

Find the increase in mass when 1 kg of water is heated from 0^@C to 100^@C . Specific heat capacity of water = 4200 J kg^(-1) K^(-1) .

Calculate the amount of heat absorbed by 100 g of ice to change into water of 30^(@)C . (Specific heat capacity of water is 1 cal//g^(@)C )

0.32 g of oxygen is kept in a rigid container and is heated. Find the amount of heat needed to raise the temperature from 25^0 C to 35^0 C . The molar heat capacity of oxygen at constant volume is 20 J K^(-1) mol^(-1) .

Calculate the value of DeltaU and DeltaH on heating 128.0 g of oxygen from 0^@C to 100^@C . CV and C_p on an average are 21 and 29 J "mol"^(-1) K^(-1) (The difference is 8J "mol"^(-1) K^(-1) which is approximately equal to R )

Find the change in the internal energy of 2 kg of water as it heated from 0^(0)C to 4^(0)C . The specific heat capacity of water is 4200 J kg^(-1) K^(-1) and its densities at 0^(0)C and 4^(0)C are 999.9 kg m^(-3) and 1000 kg m^(-3) respectively. atmospheric pressure =10^(5) Pa.

The specific heat capacity of water is ____ cal//g^(@)C