Question

How much heat in joules is needed to heat 100.0 g of solid gallium from 6.16C to liquid Ga 29.8C.

Answer #1

How much energy is required to heat 87.1 g acetone (molar
mass=58.08 g/mol) from a solid at -154.0°C to a liquid at -42.0°C?
The following physical data may be useful.

How much energy (in kilojoules) is needed to heat 4.65 g of ice
from -11.5 ∘C to 20.5 ∘C? The heat of fusion of water is
6.01kJ/mol, and the molar heat capacity is 36.6 J/(K⋅mol) for ice
and 75.3 J/(K⋅mol) for liquid water.

How much heat is released when 105 g of steam at 100.0°C is
cooled to ice at -15.0°C? The enthalpy of vaporization of water is
40.67 kJ/mol, the enthalpy of fusion for water is 6.01 kJ/mol, the
molar heat capacity of liquid water is 75.4 J/(mol • °C), and the
molar heat capacity of ice is 36.4 J/(mol • °C).

A.) How much heat is required to convert 15.0 g of ice at -13.0
∘C to steam at 100.0∘C ? Express your answer using three
significant figures. (Joules)
B.)How much heat is required to convert 15.0 g of ice at -13.0
∘C to steam at 100.0∘C? Express your answer using three significant
figures. (kcal)

How much heat energy is required to convert 32.1 g of solid iron
at 26 °C to liquid iron at 1538 °C? The molar heat of fusion of
iron is 13.8 kJ/mol. Iron has a normal melting point of 1538 °C.
The specific heat capacity of solid iron is 0.449 J/g·°C.

The specific heat capacity of liquid water is 4.18 J/g-K. How
many joules of heat are released when the temperature of 9.00 g of
water decreases from 34.2 °C to 45.5 °C?

How much heat is required to convert solid ice with a mass of
760 g at a temperature of -16.0 °C to liquid water at a temperature
of 76.5 °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.

How much heat is required to convert solid ice with a mass of
870 g and at a temperature of -22.5 °C to liquid water at a
temperature of 79.0 °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.)

How much heat is required to convert solid ice with a mass of
605 g at a temperature of -22.5 °C to liquid water at a temperature
of 65.0 °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.
(in J)

Show work
A. Aluminum has a specific heat of 0.880 J/g-degree. How many
joules are needed to heat 725g of aluminum from 20.0oC
to 125.0oC ?
B. The delta H of combustion of C2H6 is
1541kJ/mole. How many kJ of energy result when 700.0g of
C2H6 are combusted ?

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