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Con los siguientes elementos: 37Rb 33As 52Te 1H 8O 56Ba 53I forme seis compuestos con enlace iónico. Debe hacer la representació

elena-14-01-66 [18.8K]

Los electrones los representa Lewis

8 0

4 years ago

A 78.0 sample of gold at 175°C is put in a foam cup calorimeter with 25.0 g of water at 25.0°C. Calculate the specific heat of t

Nady [450]

The answer is the specific heat of the gold is 0.129 J/gC .

<h3>What is Calorimetry ?</h3>

It is an experimental method that allows one to calculate the heat change in a chemical process.

Calorimeter is just a reaction vessel. It could be a foam cup, a soda can, or a commercially available bomb calorimeter

Where q represents the heat change in the reaction, the calorimeter and the water. Since you are only measuring temperature, you will need to calculate the heat using it.

The change in heat of the gold is given by:

$\rm q_{gold} = m c_{gold}\Delta T$

$=78 \times c_{p}\times (175-38.18)$

The change in heat of the water is given by:

$\rm q_{water} = mc_{p}\Delta T$

m is the mass of water in the calorimeter in grams,

and delta T is the change in temperature.

where $\rm c_{p}$ is the specific heat of water, which is 4.184 J/gC

mass of water = 25 g of water.

Temperature T₁ = 25°C

Final Temperature = 38.18 °C

Difference between temperature = 13.18 °C

$\rm q_{water} = 25 \times 4.18\times 13.18$

For a Foam Cup Calorimeter

$\rm q_{water} = q_{cal}\\\\\\\rm 25\times4.18\times13.318 = 78 \times c_{p}\times (175-38.18)\\\\\\On \;solving\; this \;we \;get \;c_{p} = 0.129$

Therefore the the specific heat of the gold is 0.129 J/gC

To know more about Calorimeter

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4 0

2 years ago

How long would it take a car traveling with a speed of 95 km/h to travel 250 km between Plainview and Cedar Crest?

antoniya [11.8K]

It's C. about 2.4 hours.

5 0

3 years ago

A mixture consists of saw dust, salt, and pebbles. Which of the following instruments or materials would not be useful in separa

andriy [413]

The screen will not be useful in separating the mixture of saw dust, salt and pebbles.

Answer: Option C

<u>Explanation: </u>

The separation of individual elements from the mixture can be done easily if the size of the elements in the mixture is varying significantly. Just like in the present case, the size of sawdust and salt is very small compared to that of pebbles.

So by using sieves having pores of smaller sizes, pebbles can be separated from the mixture as pebbles will not pass through the minute pores. Even depending upon the size of pores, the saw dust can also be separated using it.

Similarly, we can use water also to separate this mixture as sawdust have least density it will float in water surface and pebbles being the highest density will sink and settle in the bottom of the container.

Remaining salt will get dissolved in water which can be obtained by heating the water in order to precipitate the salt. Even filter paper with different mess size will also help in separating this mixture. But as this mixture is not permeable through screen, the screen cannot be used to separate this mixture.

8 0

4 years ago

Which of the following is not a concern regarding the use of corn as biofuel

Lady_Fox [76]

The color of corn is different than the color of gasoline or coal.

5 0

4 years ago

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