Question

How much energy is needed to convert 15.0g of water at 0 C to ice? give the answer in both joules and calories.

Answer 1

Answer on the question #48670, Chemistry, Other

Question:

How much energy is needed to convert 15.0 g of water at 0 C to ice? give the answer in both joules and calories.

Solution:

The quantity of energy needed to convert 15.0 g of water at 0 C to ice is:

$$Q = - m (i c e) * \lambda ,$$

where $\lambda$ is the enthalpy of fusion. For ice, $\lambda = 334\frac{J}{g} = 79.8\frac{cal}{g}$. Then:

$$Q = - 15 * 334 = - 5010 J = - 1197.0 cal.$$

Answer: -5010 J, -1197.0 cal

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