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3 years ago

Why rust forms on iron ?

Chemistry

1 answer:

Natasha2012 [34]3 years ago

5 0

Answer:

Hope the above picture might help you :)

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At particular temperature, Kp = 70.9 for the following reactionN2O4(g) == 2NO2(g)1. A certain pressure of N2O4 is initially adde

elixir [45]

Answer : The partial pressure of $NO_2$ is, 12.34 atm

Explanation :

For the given chemical reaction:

$N_2O_4(g)\rightleftharpoons 2NO_2(g)$

The expression of $K_p$ for above reaction follows:

$K_p=\frac{(P_{NO_2})^2}{P_{N_2O_4}}$ ........(1)

The equilibrium reaction is:

$N_2O_4(g)\rightleftharpoons 2NO_2(g)$

Initial x 0

At eqm (x-y) 2y

Putting values in expression 1, we get:

$70.9=\frac{(2y)^2}{(x-y)}$ ..............(2)

As we are given that, 25.8 % of $N_2O_4$ remains at equilibrium. That means,

$25.8\% \times x=(x-y)$

$\frac{25.8}{100}\times x=(x-y)$

$0.258\times x=(x-y)$

$0.742x=y$ ..............(3)

Now put equation 3 in 2, we get the value of 'x'.

$70.9=\frac{(2\times 0.742x)^2}{(x-0.742x)}$

$x=8.31$

Now put the value of 'x' in equation 3, we get:

$0.742x=y$

$0.742\times 8.31=y$

$y=6.17$

Now we have to calculate the new partial pressure of $NO_2$ at equilibrium.

Partial pressure of $NO_2$ = (2y) = (2\times 6.17) = 12.34 atm

Hence, the partial pressure of $NO_2$ is, 12.34 atm

8 0

3 years ago

Atoms of the main group elements either gain or lose electrons so they have eight electrons in the outermost energy level. In

Yuliya22 [10]

Answer:

Hey there can you post the complete question ,i cannot find any element

8 0

3 years ago

Of a non-volatile solute is dissolved in 365.0 g of water. the solute does not react with water nor dissociate in solution. assu

kolbaska11 [484]

By using this formula of vapor pressure:
Pv(solu)= n Pv(water)
when we have Pv(solu)=231.16 torr & Pv(water)= 233.7 torr
from this formula, we can get n (mole fraction of water) by substitution:
231.16 = n * 233.7
∴ n(mole fraction of water) = 0.99
so mole fraction of solution = 1 - 0.99 = 0.01
when no.of moles of water = mass weight / molar weight
= 365g / 18g/mol = 20 moles
Total moles in solution = moles of water / mole fraction of water
= 20 / 0.99 =20.2
no. of moles of the solution= total moles in solution- moles of water
= 20.2 - 20 = 0.2 moles
when we assumed the mass weight of the solution = 16 g (missing in your question should be given)
∴ molar mass = mass weight of solute / no. of moles of solute
= 16 g / 0.2 mol = 80 g/mol

6 0

3 years ago

What is the percentage of magnesium sulfate in MgSO4 x 7H2O.

son4ous [18]

48.78%
Percentage of MgSO4 = mass of MgSO4/ mass of sample (MgSO4. 7H20) and multiply it by 100.

5 0

4 years ago

How many miles can a commercial jetliner flying at 253 meters per second travel in 6.0 hours

Goryan [66]

1 mile = 1609.344 meters
1 hour = 3600 seconds 345.48 miles per hour x 1609.344
meters/mile x 1hour/3600seconds = 154.44 meter per second~~ANSWERR

6 0

4 years ago