What is the
total amount of heat required (in kJ) to convert 192 g of ice at
-17 oC
into steam at 122 oC?
Sp. Heat for
ice = 2.09 J/goC
Sp. Heat for
water = 4.18 J/goC
Sp. Heat for
steam = 1.84 J/goC
ΔHfus = 6.01
kJ/mol
ΔHvap = 40.67
kJ/mol
Construct the flow diagram and estimate the total heat required
to convert 550 g ice at –75o C to steam at 1850 C.
(Cice = 2090 J/kg.°C, Cwater = 4186 J/kg.°C, Csteam = 2010
J/kg.°C, Lf = 3.33 × 105 J/kg, Lv = 2.26 × 106 J/kg.)
a-How much heat is required to convert 5.0 kg of ice from a
temperature of -10 C to water vapor at a temperature of 220F? b-You
have 200 g of coffee at 55 C, Coffee has the same specific heat as
water. How much ice at -5 C do you need to add in order to reduce
the coffee’s temperature to 27C.
How much heat is required to convert solid ice with a mass of
750 g and at a temperature of -26.5 °C to liquid water at a
temperature of 72.0 °C? (The specific heat of ice is cice = 2100
J/kgK, the specific heat of water is cwater = 4186.8 J/kgK, and the
heat of fusion for water is: Lf = 334 kJ/kg.)
A.)
How much heat energy, in kilojoules, is required to convert 60.0 g
of ice at -18 degrees celcius to water at 25 degrees celcius?
B.) How long would it take for 1.50 mol of water at 100
degrees Celsius to be converted completely into steam if heat were
added at a constant rate of 24.0 J/s?
Calculate the amount of heat required to convert
155 g of ice at -10oC to steam at
110oC? (Hint:
Hfusion
= 80cal/g and Hvaporization =
540cal/g - show your work on the left, final answer on the
right)
How much heat is required to convert solid ice with a mass of
605 g and at a temperature of -12.5 °C to liquid water at a
temperature of 55.5 °C? (The specific heat of ice is
cice = 2100 J/kgK, the specific heat of water is
cwater = 4186.8 J/kgK, and the heat of fusion for water
is: Lf = 334 kJ/kg.)
Part A: How much heat energy, in kilojoules, is required to
convert 45.0 g of ice at −18.0 ∘C to water at 25.0 ∘C ?
Part B: How long would it take for 1.50 mol of water at 100.0 ∘C
to be converted completely into steam if heat were added at a
constant rate of 18.0 J/s ?
Thermochemistry
1. How much heat is required to convert 180g of ice at -40C to
steam at 120C?
2. Write the thermochemical equation for the decomposition of
one mole of methanol, CH3OH(l), into its elements in their stable
states at 25C and 1atm.