Chemistry, 02.09.2019 19:00 deanlmartin

A50.00 g sample of an unknown metal is heated to 45.00°c. it is then placed in a coffee-cup calorimeter filled with water. the calorimeter and the water have a combined mass of 250.0 g and an overall specific heat of 1.035 cal/g•°c. the initial temperature of the calorimeter is 10.00°c. the system reaches a final temperature of 11.08°c when the metal is added.

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Answer from: maya4321

First, in order to calculate the specific heat capacity of the metal in help in identifying it, we must find the heat absorbed by the calorimeter using:
Energy = mass * specific heat capacity * change in temperature
Q = 250 * 1.035 * (11.08 - 10)
Q = 279.45 cal/g

Next, we use the same formula for the metal as the heat absorbed by the calorimeter is equal to the heal released by the metal.

-279.45 = 50 * c * (11.08 - 45) [minus sign added as energy released]
c = 0.165

The specific heat capacity of the metal is 0.165 cal/gC

Answer from: juan2730

The specific heat capacity of the unknown metal has been 0.164 cal/g. $\rm ^\circ C$ .

Specific heat can be defined as the amount of energy required to raise the temperature of 1 gram of a substance by 1 degree celsius.

The expression can be given as:

heat = mass $\times$ specific heat capacity $\times$ change in temperature

The heat absorbed by Calorimeter can be given as:

Heat absorbed = 250 grams $\times$ 1.035 cal/g. $\rm ^\circ C$ $\times$ (11.08 $\rm ^\circ C$ - 10.00 $\rm ^\circ C$ )

Heat absorbed by calorimeter = 250 $\times$ 1.035 $\times$ 1.08

Heat absorbed by calorimeter = 279.45 cal

The heat absorbed by calorimeter has been equal to the heat released by metal.

Heat released by metal = 279.45 cal

Heat released = mass $\times$ specific heat capacity $\times$ change in temperature

279.45 cal = 50 g $\times$ specific heat capacity $\times$ (11.08 $\rm ^\circ C$ - 45.0 $\rm ^\circ C$ )

279.45 = 50 $\times$ specific heat capacity $\times$ -33.92

Specific heat capacity = 0.164 cal/g. $\rm ^\circ C$ .

The specific heat capacity of the unknown metal has been 0.164 cal/g. $\rm ^\circ C$ .

For more information about the specific heat capacity, refer to the link:

link

Answer from: Quest

chemists can use the electron cloud model to assign electrons to different atomic orbitals. atomic orbitals also explain the patterns in the periodic table

explanation:

Answer from: Quest

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

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