How many joules of heat are needed to melt 50 g of ice at 0°C and then warm the liquid to 65°C? heat of fusion of ice = 334 J/g specific heat of water = 4.184 J/g°C specific heat of ice = 2.03 J/g°C heat of vaporization of water = 2260J/g

Explanation:

Hello,

In this case, in this heating process, we should consider two steps which have their own associated enthalpy for the same mass of water:

1) Melting of ice at 0 °C.

2) Heating of liquid water from 0 °C to 65 °C.

Therefore, the total needed heat turns out:

Regards.

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.