Four gases are described below:

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

Can someone give a brief description of

sesenic [268]

Answer:

1) Dispersion forces: It is a type of force which is present between atoms and molecules. It is a weakest intermolecular force that occurs between atoms. It is also called induced dipole-induced dipole attraction.

2. Dipole-dipole: It is a type of attractive force which is present between the negative end of one molecule with the positive end of another molecule. This type of attractive force occurs between polar molecules.

3) Hydrogen bond: It is a type of electromagnetic force which is present between hydrogen and high electronegative atoms such as nitrogen and oxygen etc.

4 0

3 years ago

An electron in the n=6 level of the hydrogen atom relaxes to a lower energy level, emitting light of ?=93.8nm. find the principa

Rama09 [41]

We can find the principal level or lower level using Rydberg's formula:

1/w = R(1/L² - 1/U²)

where:

w is the wavelength (93.8 nm),

L is the lower energy level (unknown)

U the upper energy level (n= 6)

R is Rydberg's constant (10,967,758 waves per meter)

Substituing known values into the equation:
1/(9.38 * 10^-8 m.) = 10,967,758(1/L² - 1-36)

Using the solver function of the calculator to get for L:

L = 0.999 
so L = 1.
The lower level is 1 (the ground state).

3 0

4 years ago

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How would the precision of the volume of liquid delivered by the slanted buret be affected?

Olegator [25]

The precision of the volume of liquid delivered by the slanted buret would be affected by giving you erroneous readings. You will have more volume than what really is the volume. Hope this answers the question. Have a nice day.

6 0

3 years ago

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How many independent variables can be tested in a standard scientific experiment

Shalnov [3]

One independent variable

6 0

4 years ago