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JulijaS [17]
3 years ago
6

In an endothermic reaction what is true of the enthalpy

Chemistry
1 answer:
kow [346]3 years ago
8 0
A. Hope this helps. :-)
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Calculate the specific heat capacity of aluminum if 14,200 J of heat is released in cooling a 350.0
andrew-mc [135]

Answer:

                     Specific Heat Capacity  =  0.901 J.g⁻¹.°C⁻¹

                     Heat is Exothermic

Explanation:

                     Specific heat capacity is the amount of heat required to raise the temperature of a given amount of substance by one degree.

Also, Exothermic reactions are those reaction in which the heat is lost from the system to surrounding while, endothermic reactions are those in which the system gains heat from the surroundings.

The equation used for this problem is as follow,

                                                 Q  =  m Cp ΔT   ----- (1)

Where;

           Q  =  Heat  =  14200 J

           m  =  mass  =  350 g

           Cp  =  Specific Heat Capacity  =  ??

           ΔT  =  Change in Temperature  =  70 °C  -  25 °C  =  45 °C

Solving eq. 1 for Cp,

                                Cp  =  Q / m ΔT

Putting values,

                                Cp  =  14200 J / (350 g × 45 °C)

                                Cp  =  0.901 J.g⁻¹.°C⁻¹

As the heat is lost by the metal therefore, the heat is exothermic.

3 0
2 years ago
Which of the following is NOT true of electronegativity?
polet [3.4K]
Whats the "following"?
8 0
3 years ago
A student conducts an experiment with a steel wool pad, which is comprised of iron. The student washes the steel wool in vinegar
Ksju [112]
B. A chemical change has occurred and energy was given off
3 0
3 years ago
Consider the reaction below. At 500 K, the reaction is at equilibrium with the following concentrations. [PCI5]= 0.0095 M [PCI3]
Dmitriy789 [7]

Answer: The equilibrium constant for the given reaction is 0.0421.

Explanation:

PCl_5\rightleftharpoons PCl_3+Cl_2

Concentration of [PCl_5] =  0.0095 M

Concentration of [PCl_3] =  0.020 M

Concentration of [Cl_2] =  0.020 M

The expression of the equilibrium constant is given as:

K_c=\frac{[PCl_3][Cl_2]}{[PCl_5]}=\frac{0.020 M\times 0.020 M}{0.0095 M}

K_c=0.0421 (An equilibrium constant is an unit less constant)

The equilibrium constant for the given reaction is 0.0421.

6 0
3 years ago
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The levels of organization within an organism are atom,
OleMash [197]

Answer:

The answer is: Molecule and Organ system.

4 0
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