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DanielleElmas [232]
4 years ago
10

Use the data in the table above to calculate an approximate ΔH∘ in kilojoules for the synthesis of hydrazine from ammonia:

Chemistry
1 answer:
ankoles [38]4 years ago
8 0
DeltaH formation = deltaH of broken bonds - deltaH of formed bonds

Broken bonds: tiple bond N-N and H-H bond
Formed bonds: N-H and N-N bonds

You also have to take note of the molar coefficients

deltaH formation = <span> [(N≡N) + 2 * (H-H)] - [4 * (N-H) + (N-N)] 
                           = (945 + 2*436) - (4*390 + 240)
                            = 17 kJ/mol

The answer is 17 kJ/mol.</span>
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frosja888 [35]

Answer:

cells are what make up they body they produce lots of things to keep you alive.

Explanation:

They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions. Cells also contain the body's hereditary material and can make copies of themselves

6 0
2 years ago
A 10.00 kg block of iron is heated from 10.0 ° C to 95.0 °C. The specific heat of iron is 0.45 kJ/(kg·°C). How much energy is gi
max2010maxim [7]

Answer:

Q = 382.5 Kj

Explanation:

Given data:

Mass of block = 10.00 Kg

Initial temperature = 10.0°C

Final temperature = 95.0°C

Specific heat capacity of iron = 0.45 KJ/Kg.°C

Energy given = ?

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 95.0°C - 10.0°C

ΔT = 85.0°C

Q = 10.00 Kg×0.45 KJ/Kg.°C×85.0°C

Q = 382.5 Kj

4 0
3 years ago
Which statement about mixtures and solutions is incorrect?
harkovskaia [24]
B)all  solutions are mixtures

5 0
4 years ago
What is the radioactive nucleus before it decays​
Darina [25.2K]

Answer:

Alpha decay is one type of radioactive decay, in which an atomic nucleus emits an alpha particle, and thereby transforms (or "decays") into an atom with a mass number decreased by 4 and atomic number decreased by 2.

Explanation:

7 0
3 years ago
Consider the following chemical equilibrium:
jok3333 [9.3K]

Answer:

Kc = [CH₄] / [H₂]²

Kp = [CH₄] / [H₂]² * (0.082*T)^-1

Explanation:

Equilibrium constant, Kc, is defined as the ratio of the concentrations of the products over the reactants. Also, each concentration of product of reactant is powered to its coefficient.

<em>Pure solids and liquids are not taken into account in an equilibrium</em>

Thus, for the reaction:

C(s)+ 2H₂(g) ⇌ CH₄(g)

Equilibrium constant is:

<h3>Kc = [CH₄] / [H₂]²</h3>

Now, using the formula:

Kp = Kc* (RT)^Δn

<em>Where R is gas constant (0.082atmL/molK), T is the temperature of the reaction and Δn is difference in coefficients of gas products - coefficients of gas reactants (1 - 2= -1)</em>

Replacing:

<h3>Kp = [CH₄] / [H₂]² * (0.082*T)^-1</h3>

<em />

4 0
3 years ago
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