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ANEK [815]
3 years ago
14

Answer these 2 questions FAST PLEASEE!!! I WILL GIVE BRAINLIEST AND GIVE EXTRA POINTS

Chemistry
1 answer:
madreJ [45]3 years ago
7 0

Answer:

q5: b

q6: a

Explanation:

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The standard enthalpy change for the following reaction is 873 kJ at 298 K.
Flura [38]

Answer:  - 436.5 kJ.

Explanation:

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation.

The given chemical reaction is,

2KCl(s)\rightarrow 2K(s)+Cl_2(g)  \Delta H_1=873kJ

Now we have to determine the value of \Delta H for the following reaction i.e,

K(s)+\frac{1}{2}Cl_2(g)\rightarrow KCl(s) \Delta H_2=?

According to the Hess’s law, if we divide the reaction by half then the \Delta H will also get halved and on reversing the reaction , the sign of enthlapy changes.

So, the value \Delta H_2 for the reaction will be:

\Delta H_2=\frac{1}{2}\times (-873kJ)

\Delta H_2=-436.5kJ

Hence, the value of \Delta H_2 for the reaction is -436.5 kJ.

8 0
3 years ago
Some thermodynamic properties of ethanol are listed in the table. Thermodynamic Properties Property Value c (solid) 0.5 J/g °C c
alexira [117]
<h2>Answer </h2>

Option C - 320J

<u>Explanation </u>

Since ethanol solid at −120 °C and is only cooling down (it won’t change states) . The amount of Thermodynamic properties values c is given in form of solid, liquid and gas. Amount of energy released is calculated below.  

Formula,

= change in temperature  x specific heat capacity for solid ethanol x 40

=> 0.5 x 16x 40 = 320J

Therefore, the 320J of heat is released when 40.0g of ethanol cools.

4 0
3 years ago
The what and what properties of a substance affect how substances in a mixture seperate
kompoz [17]

Psychical(you see the changes visible) and Chemical properties(they react and combine, you may see fizzing or bubbles).

7 0
3 years ago
Can anyone help with last part that's all I need and can they give a explanation Please?
oee [108]

Answer:

sure what u need help with

Explanation:

5 0
3 years ago
What physical properties are important for the materials used to make mountain bikes?
Nikitich [7]

Answer:

density, yield strength, elasticity, Ductility, toughness, fatigue limit and corrosion resistance

7 0
2 years ago
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