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m_a_m_a [10]
3 years ago
13

The specific heat capacity of silver is 0.235 J/g ∙ K. Its melting point is 962 °C, and its enthalpy of fusion is 11.3 kJ/mol. W

hat quantity of energy, in joules, is required to change 9.70 g of silver from a solid at 25 °C to a liquid at 962 °C?
Chemistry
1 answer:
likoan [24]3 years ago
3 0

<u>Answer:</u> The total heat required for the conversion process is 1228.5 J

<u>Explanation:</u>

The processes involved in the given problem are:  

1.)Ag(s)(25^oC,298K)\rightarrow Ag(s)(962^oC,1235K)\\2.)Ag(s)(962^oC,1235K)\rightarrow Ag(l)(962^oC,1235K)

  • <u>For process 1:</u>

To calculate the amount of heat absorbed, we use the equation:

q_1=m\times C_{p,l}\times (T_{2}-T_{1})

where,

q_1 = amount of heat absorbed = ?

C_{p,s} = specific heat capacity = 0.235 J/g.K

m = mass of silver = 9.70 g

T_2 = final temperature = 1235 K

T_1 = initial temperature = 298 K

Putting all the values in above equation, we get:

q_1=9.70g\times 0.235J/g.K\times (1235-298)K=213.6J

  • <u>For process 2:</u>

To calculate the amount of heat released, we use the equation:

q_2=m\times L_f

where,

q_2 = amount of heat absorbed = ?

m = mass of silver = 9.70 g

L_f = latent heat of fusion = 11.3 kJ/mol = \frac{11300J/mol}{108g/mol}=104.63J/g   (Conversion factor:  1 kJ = 1000 J; Molar mass of silver = 108 g/mol)

Putting all the values in above equation, we get:

q_2=9.70g\times 104.63J/g=1014.9J

Total heat required for the conversion = q_1+q_2

Total heat required for the conversion = [213.6+1014.9]J=1228.5J

Hence, the total heat required for the conversion process is 1228.5 J

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kari74 [83]

Answer:

well, chlorine will undergo in a chemical reaction

Explanation:

neon has completed valence shells, so it neither need electron and or it also don't need to donate the electrons. hence it will not participate in any chemical reaction and it is stable in nature.

whereas chlorine need one more electron to complete it's valence shell and in order to be stable , so it will try to gain one electron , hence

it will take place in a chemical reaction

6 0
2 years ago
How are physical and<br>chemical changes different?​
astra-53 [7]
Physical changes happen when you do/mix something that can be reversed. Best example is ripping a paper, you can just tape it back together so it is just an observable thing that changes, which is a physical change. Chemical changes happen when you mix things and they make a new substance and can’t be reversed. The best example of this is the Statue of Liberty, which changed in color due to the chemical change between the oxygen and copper, which created a new substance (rust) which made it green instead of copper.
Sorry for the long answer but hope this helps!
5 0
3 years ago
NEED HELP ASAPPP<br><br> What is the number of beryllium atoms in 78.0g of Be?
polet [3.4K]

Answer: number of atoms is 5.21 · 10^24

Explanation: Atomic mass of Be is 9.012 g/mol.

Number of moles n = m/M = 78.0 g / 9.012 g/mol =

Multiply this with Avogadro number Na = 6.022*10^23 1/mol

4 0
3 years ago
Draw the conjugate base for the Brønsted-Lowry acid-base reaction that occurs when the following acid reacts with water. Show al
DanielleElmas [232]

Answer:

The structures are shown below.

Explanation:

When the acid reacts with water, it loses one proton (H⁺) and forms a base, which is the conjugate base of its acid.

The formal charge of an atom can be calculated by:

FC = X - (Y + Z/2)

Where X is the valence electrons of the neutral atom, Y is the unshared electrons, and Z is the shared electrons in the molecule.

a) When HCl deprotonates, it forms Cl⁻ as the conjugate base. The neutral atom Cl has 7 valence electrons (X), the ion has 8 unshared electrons (Y) and none shared electrons, so FC = -1 The structure is shown below in figure a.

b) When Hbr deprotonates it forms Br- as the conjugate base. The neutral atom has 7 valence electrons (X), the ion has 8 unshared electrons (Y) and none shared electrons, so FC = -1. The structure is shown below in figure b.

c) When CH3COOH loses a proton, it forms the conjugate base CH3COO⁻. The carbon as 4 valence electrons, hydrogen has 1 valence electron and oxygen has 6 valence electrons. The first carbon make simple bonds with each hydrogen and with the second carbon, and so, all the electrons are shared, and it has FC = 4 - (0 + 8/2) = 0, as so the hydrogens have FC = 1 - (0 + 2/2) = 0.

The second carbon does 1 simple bond with the first carbon, a double bond with one oxygen, and a simple bond with the other oxygen, and so doesn't have unshared electrons, and FC = 4 - (0 + 8/2) = 0.

The first oxygen does a double bond with the carbon, and so it has 4 unshared electrons, so FC = 6 - (4 + 4/2) = 0. The second oxygen does a simple bond with the carbon, and so has 5 unshared electrons, so FC = 6 - (5 + 2/2) = 0.

The structure is shown in figure c.

7 0
3 years ago
Read 2 more answers
What is an example of a soultion
Marrrta [24]

Answer:

Did you mean solution??

In chemistry, a solution is considered as a special type of homogeneous mixture composed of two or more substances. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent.

Eg: sweet tea or coffee (sugar added to solution)

     bleach (sodium hypochlorite dissolved in water)

HOPE IT HELPS :)

3 0
3 years ago
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