Question

In: Chemistry

in an experiment, 15.0 g of ice at -30 celsius is converted into steam with a...

in an experiment, 15.0 g of ice at -30 celsius is converted into steam with a temperature of 115 celsius. How much energy is required for this process? DHvap= 2260 J/g; DHfus= 334 J/g; cs(ice)= 2.06 J/(g celsius; cs(water)= 4.18 J/(g celsius; cs(steam)= 1.99 J/(g celsius))

Solutions

Expert Solution

ice converted to 00C water   q1 = mcT

                                                     = 15*2.06*(0-(-30)

                                                      = 15*2.06*30   = 927J

heat of fustion of ice               q2   = m*H fus

                                                  = 15*334   = 5010J

water converted to vapor   q3   = mcT

                                                   = 15*4.18*(100-0)   = 6270J

water vapor converted to 1150C q4 = mcT

                                                             = 15*1.99*(115-100)

                                                              = 447.75J

heat of vaporisation                      q5   = m*Hvap

                                                              = 15*2260   = 33900J

The total energy                         q   = q1+ q2+q3+q4+q5

                                                           = 927+5010+6270+447.75+ 33900   = 46554.75J


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