R12B1 is a refrigerant with the formula CF2CIBr. Use the information in the tabl
ID: 104379 • Letter: R
Question
R12B1 is a refrigerant with the formula CF2CIBr. Use the information in the table below to determine ow many grams of R12B1 must be vaporized in order to absorb enough energy to cool 200.0 grams of DMSO from 45.0°C to 20.0°C? grams Specific Heat Capacity Liquid m.w. m.p. b.p Solid Gas substance Ethanol Water DMSO t-Butanol Ammonia Freon-12 R12B1 formula C2HEOH H20 C2H6SO C4H100 NH3 CCI2F2 CF2CIBr g/mol 5.02 6.01 14.4 6.78 38.6 40.67 48.6 39.1 23.35 20.09 22.37 0.970 2.09 1.80 1.97 2.30 4.184 1.96 2.9 1.94 1.84 1.20 1.73 2.17 0.612 0.451 46.069-114.0 78.0 18.015 0.0 78.129 19.0 74.123 25.2 17.03 -77.7 100.0 189.0 82.4 33.33 120.9158.0 29.75 165.36159.5 4.01Explanation / Answer
we have fro DMSO:
m = 200 g
C = 1.96 J/g.oC
Ti = 45 oC
Tf = 20 oC
we have below equation to be used:
Q = m*C*(Tf-Ti)
Q = 200.0*1.96*(20.0-45.0)
Q = -9800 J
Q = -9.800 KJ
This heat is absorbed by R12B1
Q = Hvap*number of mol
9.800 KJ = 22.37 KJ/mol * number of mol
number of mol = 0.438 mol
mass = number of mol * molar mass
= 0.438 mol * 165.36 g/mol
= 72.4 g
Answer: 72.4 g
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