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Ch.5 - Thermochemistry
Brown - Chemistry: The Central Science 15th Edition
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Tutti i libri di testoBrown 15th EditionCh.5 - ThermochemistryProblema 49
Capitolo 5, Problema 49

b. What are the units of specific heat?

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Understand that specific heat is a property of a substance that indicates how much heat energy is required to raise the temperature of a given mass of the substance by one degree Celsius (or one Kelvin).
Recall the formula for specific heat: \( q = mc\Delta T \), where \( q \) is the heat absorbed or released, \( m \) is the mass, \( c \) is the specific heat, and \( \Delta T \) is the change in temperature.
Identify the units for each component in the formula: \( q \) is typically measured in joules (J), \( m \) in grams (g), and \( \Delta T \) in degrees Celsius (°C) or Kelvin (K).
Rearrange the formula to solve for specific heat \( c \): \( c = \frac{q}{m\Delta T} \).
Determine the units of specific heat by substituting the units of each variable into the rearranged formula: \( c \) has units of \( \frac{J}{g \cdot °C} \) or \( \frac{J}{g \cdot K} \).

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Specific Heat Capacity

Specific heat capacity is the amount of heat required to raise the temperature of one gram of a substance by one degree Celsius (°C) or one Kelvin (K). It is a material property that indicates how much energy is needed to change the temperature of a substance, which varies between different materials.
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Heat Capacity

Units of Measurement

The units of specific heat are typically expressed in joules per gram per degree Celsius (J/g·°C) or joules per kilogram per Kelvin (J/kg·K). These units reflect the energy (in joules) needed to change the temperature of a specific mass of a substance, highlighting the relationship between heat energy, mass, and temperature change.
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Units of Radiation Measurement

Heat Transfer

Heat transfer is the process of thermal energy moving from one object or substance to another due to a temperature difference. Understanding specific heat is crucial in heat transfer calculations, as it helps predict how much energy will be absorbed or released by a substance when it undergoes a temperature change.
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Domanda del libro di testo

Consider the decomposition of liquid benzene, C6H6(l), to gaseous acetylene, C2H2(g): C6H6(l) → 3 C2H2(g) ΔH = +630 kJ (c) Which is more likely to be thermodynamically favored, the forward reaction or the reverse reaction?

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Domanda del libro di testo

(d) How many kJ of heat are needed to raise the temperature of 10.00 kg of liquid water from 24.6 to 46.2 °C?

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Domanda del libro di testo

Consider the decomposition of liquid benzene, C6H6(l), to gaseous acetylene, C2H2(g): C6H6(l) → 3 C2H2(g) ΔH = +630 kJ (b) What is H for the formation of 1 mol of acetylene?

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Domanda del libro di testo

Two solid objects, A and B, are placed in boiling water and allowed to come to the temperature of the water. Each is then lifted out and placed in separate beakers containing 1000 g of water at 10.0 °C. Object A increases the water temperature by 3.50 °C; B increases the water temperature by 2.60 °C. (a) Which object has the larger heat capacity?

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Domanda del libro di testo

(c) What is the heat capacity of 185 g of liquid water?

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Domanda del libro di testo

Consider the decomposition of liquid benzene, C6H6(l), to gaseous acetylene, C2H2(g): C6H6(l) → 3 C2H2(g) ΔH = +630 kJ (d) If C6H6(g) were consumed instead of C6H6(l), would you expect the magnitude of ΔH to increase, decrease, or stay the same? Explain.

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