Ice vs. Dry Ice total BTU cooling to 25 degrees C

[bguthire]

I wanted to ask which would provide the largest total BTU cooling regular ice from water or dry ice to reach a temperature of 25 degrees C?

1 lb of Ice would start at -3 degrees C to 25 degrees C at sea level = total BTU
1 lb of Dry ice would start at -80 degrees C to 25 degrees C at sea level = total BTU

 

[mgb_phys]

You need the heat of fusion = the energy released when a mass of a solid melts
and the specific heat capacity = the energy released by deg rise in temperature once the substance has melted.

Although the CO2 is at a lower temperature the heat capacity of a gas is much lower than water.