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elena-s [515]
4 years ago
8

Need help with this question

Chemistry
2 answers:
Goryan [66]3 years ago
8 0
Why it sideways doe
Liula [17]3 years ago
3 0

Answer:

I think it's c

Explanation:

I hope this helps :)

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What is concentration of hydrogen ion a given acid if its PH value is 9?​
TEA [102]
-log(9)= -0.954
______________
6 0
3 years ago
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Phosphorous pentachloride decomposes according to the reaction
guajiro [1.7K]

Answer: The equilibrium constant, K_c, for the reaction is 0.061.

Explanation:

Initial concentration of PCl_5  = \frac{\text {given mass}}{\text {Molar mass}\times Volume in L}}=\frac{12.3g}{208.2g/mol\times 1.50L}=0.039M  

Equilibrium concentration of PCl_5 = \frac{31.8}{100}\times 0.039=0.012M  

The given balanced equilibrium reaction is,

                            PCl_5(g)\rightleftharpoons PCl_3(g)+Cl_2(g)

Initial conc.              0.039 M                0 M        0 M

At eqm. conc.     (0.039-x) M              (x) M   (x) M

Given : (0.039-x) = 0.012

x = 0.027

The expression for equilibrium constant for this reaction will be,

K_c=\frac{[Cl_2]\times [PCl_3]}{[PCl_5]}

Now put all the given values in this expression, we get :

K_c=\frac{0.027\times 0.027}{0.012}=0.061

The equilibrium constant, K_c, for the reaction is 0.061.

4 0
4 years ago
21.6 J of energy are used to heat a 2.0 g piece of iron from 5.0oC to 29.0oC. What is the experimental specific heat capacity of
vesna_86 [32]

Answer: 0.45 J / g °C

Explanation: solution attached.

Heat is equal to the product of mass, specific heat and change in temperature.

Q= mc∆T

Derive the equation to find c

c = Q / m∆T substitute the values

c = 21.6 J / 2.0g ( 24°C - 5°C)

c = 0.45 J / g ° C

4 0
3 years ago
The reaction between nitrogen and hydrogen to produce ammonia is described by the equilibrium reaction 3 H 2 + N 2 − ⇀ ↽ − 2 NH
77julia77 [94]

The question correctly reads:

The reaction between nitrogen and hydrogen to produce ammonia is described as an equilibrium reaction. What substances are present in the reaction mixture when equilibrium has been obtained?

3H2 + N2 = 2NH3

N2

H2

NH4+

NH3

Answer:

N2,H2,NH3

Explanation:

Equilibrium is said to be attained when the rate of forward reaction equals the rate of reverse reaction. That is forward and reverse reactions occur at the same rate. The rate at which reactants are reformed, is the same rate at which products are formed. Hence at equilibrium both reactants and products are present in the reaction mixture. This implies that nitrogen, hydrogen and ammonia are all present in the reaction mixture at equilibrium.

8 0
3 years ago
2. Can the "facts” of science change over time? If so, how
Aleks [24]
Definitely, the more you research into something the more information on it you’ll get, they could very well realize that with the new information their old faces were incorrect
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3 years ago
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