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s344n2d4d5 [400]
3 years ago
10

Calculate the enthalpy change,,ΔH=∑ Hp - ∑ HR for the following reaction using equations 1, 2 C graphite(s) --> C diamond(s)

The following is known. 1. Cgraphite(s) + O2(g) --> CO2(g) ∆H = -394 kJ 2. Cdiamond(s) + O2(g) --> CO2(g) ∆H = -396 kJ A. -763kJ B. 2kJ C. 790kJ D. -2kJ
Chemistry
1 answer:
Murljashka [212]3 years ago
6 0

Answer:

\large \boxed{ \text{B. 2 kJ}}

Explanation:

We have two equations:

1. C(s, graphite) + O₂(g) ⟶ CO₂(g);  ∆H = -394 kJ  

2. C(s, diamond) + O₂(g) ⟶CO₂(g); ∆H = -396 kJ  

From these, we must devise the target equation:

3. C(s, graphite) ⟶ C(s,diamond); ΔH = ?

The target equation has C(s, graphite) on the left, so you rewrite Equation 1.

4. C(s, graphite) + O₂(g) ⟶ CO₂(g);  ∆H = -394 kJ  

Equation 4 has CO₂ on the right, and that is not in the target equation.

You need an equation with CO₂ on the left, so you reverse Equation 2.  

When you reverse an equation, you reverse the sign of its ΔH.

5.  CO₂(g)⟶ C(s, diamond) + O₂(g); ∆H = +396 kJ  

Now, you add equations 4 and 5, cancelling species that appear on opposite sides of the reaction arrows.

When you add equations, you add their ΔH values.

You get the target equation 3:

4. C(s, graphite) +<u> O₂(g)</u> ⟶ <u>CO₂(g)</u>; ∆H =  -394 kJ  

5. <u>CO₂(g)</u><u> ⟶ C(s, diamond) + </u><u>O₂(g</u>); ∆H = <u>+396 kJ </u>

3. C(s, graphite) ⟶ C(s, diamond);   ΔH =        2 kJ

\Delta H \text{ for the reaction is $\large \boxed{\textbf{2 kJ/mol}}$}

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Be sure to answer all parts. Calculate the molality, molarity, and mole fraction of FeCl3 in a 24.0 mass % aqueous solution (d =
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Answer:

m= 1.84 m

M= 1.79 M

mole fraction (X) =

Xsolute= 0.032

Xsolvent = 0.967

Explanation:

1. Find the grams of FeCl3 in the solution: when we have a mass % we assume that there is 100 g of solution so 24% means 24 g of FeCl3 in the solution. The rest 76 g are water.

2. For molality we have the formula m= moles of solute / Kg solvent

so first we pass the grams of FeCl3 to moles of FeCl3:

24 g of FeCl3x(1 mol FeCl3/162.2 g FeCl3) = 0.14 moles FeCl3

If we had 76 g of water we convert it to Kg:

76 g water x(1 Kg of water/1000 g of water) = 0.076 Kg of water

now we divide m = 0.14 moles FeCl3/0.076 Kg of water

m= 1.84 m

3. For molarity we have the formula M= moles of solute /L of solution

the moles we already have 0.14 moles FeCl3

the (L) of solution we need to use the density of the solution to find the volume value. For this purpose we have: 100 g of solution and the density d= 1.280 g/mL

The density formula is d = (m) mass/(V) volume if we clear the unknown value that is the volume we have that (V) volume = m/d

so V = 100 g / 1.280 g/mL = 78.12 mL = 0.078 L

We replace the values in the M formula

M= 0.14 moles of FeCl3/0.078 L

M= 1.79 M

3. Finally the mole fraction (x)  has the formula

X(solute) = moles of solute /moles of solution

X(solvent) moles of solvent /moles of solution

X(solute) + X(solvent) = 1

we need to find the moles of the solvent and we add the moles of the solute like this we have the moles of the solution:

76 g of water x(1 mol of water /18 g of water) = 4.2 moles of water

moles of solution = 0.14 moles of FeCl3 + 4.2 moles of water = 4.34 moles of solution

X(solute) = 0.14 moles of FeCl3/4.34 moles of solution = 0.032

1 - X(solute) = 1 - 0.032 = 0.967

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