How many milliliters of water at 25.0°C with a density of 0.997 g/mL must be mixed with 157 mL of coffee at 94.7°C so that the resulting combination will have a temperature of 56.9°C? Assume that coffee and water have the same density and the same specific heat (4.18 J/g·°C) across the temperature range.

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.

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