There are 270 Calories in a Hershey\'s ® Milk Chocolate bar. The following data

Question

There are 270 Calories in a Hershey's® Milk Chocolate bar. The following data might be useful: Hvap = 43.9 kJ/mol, Hfusion = 6.02 kJ/mol, Hsublimation = 49.9 kJ/mol, specific heat of ice = 2.05 J g-1°C-1, specific heat of water = 4.18 J g-1°C-1, and specific heat of steam = 2.08 J g-1°C-1. Assume the specific heat of water does not change with temperature. (Density of ice = 0.920 g/mL).

If all of the energy in the bar were used to heat up 75.0 mL of ice at -25.0 °C, how hot would the water get?

How much energy is used up at each step of the heating, including heating the solid, melting, heating the liquid, and vaporization?

Explanation / Answer

270 calories correspond to =270*4.18 joules=1128.6 calories

1. Heating ice from -25 deg.c to 0 deg.c = mass*specific heat* temperature difference= 75ml*0.92 g/ml*2.05*(0-(-25))=3536.23 calories. that does suggest that ice does not melt. let the temperature be T

75*0.92*2.05*(T+25)= 1128.6 calories

T+25= 7.978

T= -25+7.978= -17.021 deg.c

This is the tempeature of water

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