How much energy is needed to melt 25.4 grams od I2?
How much energy is needed to melt 25.4 grams od I2?
To calculate the amount of energy required to melt a substance, we need to know the heat of fusion for that substance. The heat of fusion is the energy needed to change a substance from a solid to a liquid at its melting point.
In the case of iodine (I2), the heat of fusion is 15.52 kilojoules per mole (kJ/mol). To calculate the energy required to melt a specific amount of iodine, we need to convert the mass of iodine to moles using its molar mass.
The molar mass of iodine (I2) is the sum of the atomic masses of two iodine atoms.
Molar Mass of I2 = (2 * Atomic Mass of I) = (2 * 126.90 g/mol) = 253.80 g/mol
Now, we can convert the mass of iodine given (25.4 grams) to moles:
Moles of I2 = Mass of I2 / Molar Mass of I2
= 25.4 g / 253.80 g/mol
= 0.10 mol
To calculate the energy required, we use the formula:
Energy = Moles of I2 * Heat of Fusion
Energy = 0.10 mol * 15.52 kJ/mol
= 1.55 kJ
Therefore, approximately 1.55 kilojoules of energy is needed to melt 25.4 grams of iodine.