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3 years ago

What element make up organic compounds?

1 answer:

6 0

Carbon atoms make up organic compounds.
Organic compounds are molecules that contain carbon atoms covalently bonded to hydrogen atoms (C-H bonds). Many organic compounds are formed from chains of covalently-linked carbon atoms with hydrogen atoms attached to the chain (a hydrocarbon backbone).

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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

A(n) ____________ is a substance in which all the exact combinations of elements are always the same.

sveta [45]

B. compound
source is Glencoe Science book grade 7.
Also I just happening to be learning about this at school

3 0

3 years ago

In the reaction of silver nitrate with copper metal, metallic silver comes out of solution, and the solution turns blue. This as

aalyn [17]

Answer:

Single displacement reaction.

Explanation:

Hello!!

In this case, since the reaction between silver nitrate and copper metal is:

$2AgNO_3(aq)+Cu(s)\rightarrow 2Ag(s)+Cu(NO_3)_2(aq)$

As silver was forming silver nitrate, due to the presence of copper, which has the capacity to displace silver out of the salt, we notice the formation of solid silver and a resulting copper (II) nitrate which is blue in aqueous solution.

Therefore, this is a single displacement reaction, because the the lonely copper displaced the silver.

Best regards!

7 0

3 years ago

What is the main intermolecular force in H2CO?

aivan3 [116]

Dipole-dipole interactions, and London dispersion interactions

5 0

4 years ago

You need to produce a buffer solution that has a pH of 5.26. You already have a solution that contains 10. mmol (millimoles) of

Andreas93 [3]

The question is incomplete, complete question is :

You need to produce a buffer solution that has a pH of 5.50. You already have a solution that contains 10 mmol (millimoles) of acetic acid. How many millimoles of acetate (the conjugate base of acetic acid) will you need to add to this solution? The pka of acetic acid is 4.74.

Answer:

33.11 millimoles of acetate we will need to add to this solution.

Explanation:

To calculate the pH of acidic buffer, we use the equation given by Henderson Hasselbalch:

$pH=pK_a+\log(\frac{[salt]}{[acid]})$