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Does the sign of the enthalpy of fusion change depending on the direction of the phase change for example the enthalpy of fusion of water is 6025 JK per mol and going from liquid to ice is -6025?
No, the sign of the enthalpy of fusion does not change depending on the direction of the phase change. The enthalpy of fusion is always defined as the energy needed to convert one mole of a substance from solid to liquid or vice versa. In the case of water, the enthalpy of fusion is positive when going from ice to liquid water and negative when going from liquid water to ice.
What is the negative heat for water as a ice?
The heat of fusion refers to the energy required to change a substance from a solid to a liquid at its melting point. For water to change from ice to liquid water, heat needs to be added, making the heat of fusion a positive value.
How many calories are required at 0 degree Celsius to melt an ice cube with a mass of g?
What you need is the enthalpy of fusion for ice and simply multiply it by your mass. An online search shows that the enthalpy of fusion for ice is: 79.72 cal/g So calories needed to melt all your ice is just. Energy = 79.72cal/g x 25g = 242.50 calories
Is ice melting a chemical or physical changes?
melting ice a physical change
Is a ice melting physical or chemical change?
melting ice a physical change
