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3 years ago

HELPP ME !!!! DUE NOW!!!!!!

Chemistry

2 answers:

Deffense [45]3 years ago

8 0

Answer:

the answer is

Explanation:

hopeit help

sukhopar [10]3 years ago

5 0

Answer:

A.seven

B.eight

D.five

Csix

Explanation:

Hope this help

Mark brainliest

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Air is a mixture of gases that is about 78.0% N2 by volume. When air is at standard pressure and 25.0 ∘C, the N2 component will

Gemiola [76]

Answer:

The value of Henry's law constant for N2 = 6.26 * 10^-4 M/ atm

Explanation:

Step 1: Data given

Temperature = 25.0 °C

The N2 component will dissolve in water with a solubility of 4.88*10^−4 M

air is at standard pressure = 1.00 atm

Step 2: Calculate Henry's law constant for N2

C=k*Pgas

⇒ with C = the solubility of a gas at a fixed temperature in a particular solvent

⇒ with k = Henry's law constant

⇒ with Pgas = the partial pressure of the gas

k = C/Pgas

Since 78.0 % of the gas is N2

P(N2) = 0.78 atm

k = C/P(N2) = (4.88*10^−4 M)/(0.78 atm)

k = 6.26 * 10^-4 M/ atm

The value of Henry's law constant for N2 = 6.26 * 10^-4 M/ atm

7 0

4 years ago

Write 6.3 x 10^2 in standard form. O 0.063 O 630 O 63 O 63

Leto [7]

Answer:

it will be 630

Explanation:

7 0

3 years ago

Describe two human activities that can affect the water cycle.

vova2212 [387]

Deforestation....trees release water vapour..with the trees being cut down less water vapour is being released..
consuming the water.... we use up water for drinking and for our homes etc...
hope this helps!

4 0

4 years ago

Read 2 more answers

Use your periodic table to identify the name for each element in a compound

Elden [556K]

... where is the image??

Here is an example though:
If you were given NaCl (this is he chemical formulafor table salt) you could identify Na (first column, or group, on your periodic table (PT) and 2nd row, or period, on your PT) as sodium.
The Cl you could identify as Chloride.

3 0

3 years ago

Given the E0 values of the following two half-reactions: Zn  Zn2+ + 2e- E0 = 0.763 volt Fe  Fe2+ + 2e- E0 = 0.441 volt a) Writ

34kurt

Answer:

For a: The balanced chemical equation is written below.

For b: The corrosion of iron pipe will take place in the presence of zinc.

For c: Zinc will not protect iron pipe from corrosion.

Explanation:

For a:

The given half reaction follows:

The substance having highest positive $E^o$ potential will always get reduced and will undergo reduction reaction. Here, zinc will undergo reduction reaction will get reduced.

Oxidation half reaction: $Zn\rightarrow Zn^{2+}+2e^-;E^o_{Zn^{2+}/Zn}=-0.763V$

Reduction half reaction: $Fe+2e^-\rightarrow Fe;E^o_{Fe^{2+}/Fe}=-0.441V$

The balanced chemical equation follows:

$Fe+Zn^{2+}\rightarrow Fe^{2+}+Zn$

For b:

For a reaction to be spontaneous (thermodynamically feasible) , the standard electrode potential must be positive.

To calculate the $E^o_{cell}$ of the reaction, we use the equation:

$E^o_{cell}=E^o_{cathode}-E^o_{anode}$

Substance getting oxidized always act as anode and the one getting reduced always act as cathode.

Calculating the $E^o_{cell}$ using above equation, we get:

$E^o_{cell}=-0.441-(-0.763)=0.322V$

As, the EMF is coming out to be positive, the reaction will be thermodynamically feasible and corrosion of iron pipe will take place in the presence of zinc.

For c:

As, the EMF of the cell is positive, the zinc will not protect the iron pipe from corrosion and the reaction will take place.

4 0

3 years ago