What is the amount of heat required to completely melt a 200.-gram sample of h2o(s) at stp?

66.7 kJ

Explanation:

1) The amounf of heat to melt an amount of water (H₂O s) is equal to the amount of water times the melting latent heat.

2) The melting latent heat of water is found in tables or a textbook. It is 6.01 kJ / mol

3) Since, the melting latent heat of water found is per mol, we have to convert the givent mass of water into number of moles:

number of moles = mass in grams / molar mass = 200 g / 18.01 g/mol = 11.1 mol

4) Calculation of the heat required:

Heat = 11.1 moles × 6.01 kJ / mol = 66.7 kJ.

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