the sume of heats gained is zero.
Heat to heat ice from -20 to 0
heat to melt ice at zero
heat to heat melted to temp from 0 to 50
heat to heat original water from 80 to 50
add these up, and find mass ice. Notice one of the heats above is negative, so it makes the heats add to zero...
a beaker contains 500g of water at a temperature of 80 C. How much ice at a temperature -20 C must be dropped in the water so that the final temperature of the system will be 50 C
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