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Vikki [24]
3 years ago
6

For each of the following reactions, identify another quantity that is equal to DeltH degree rxn.

Chemistry
1 answer:
s344n2d4d5 [400]3 years ago
8 0

Answer:

1) CH_{4}(g) + 2O_{2}(g) --->CO_{2}(g) + 2H_{2}O(l)

Enthalpy of combustion.

2) CH_{4}(g)----> C(g) + 4H(g)

4x bond energy of C - H

3) C(graphite) + 2H_{2}(g)--->CH_{4}(g)

enthalpy of formation of CH₄(g)

4) C(g) + 4H(g) ---> CH_{4}(g)

- 4x bond energy of C - H

Explanation:

The enthalpy of reaction is the heat change during the reaction.

It can be:

a) Enthalpy of combustion : the heat change during complete burning of one mole of a substance in presence of oxygen.

CH_{4}(g) + 2O_{2}(g) --->CO_{2}(g) + 2H_{2}O(l)

b) Enthalpy of formation: the heat change during formation of one mole of a substance from its constituent elements in their native state.

C(graphite) + 2H_{2}(g)--->CH_{4}(g)

c) The difference in the bond energies of reactants and products.

enthalpy= sumofbondenergiesofreactants-sumofbondenegiesofproducts

For:

C(graphite) + 2H_{2}(g)--->CH_{4}(g)

Enthalpy=[0]-[4XbondenergyofC-H]=-4XbondenergyofC-H

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A match has about 21 milligrams of red phosphorus coating the tip. How many atoms of phosphorus is this?
MAXImum [283]

Answer:

4.083 * 10^20 atoms.

Explanation:

One Mole of phosphorus  contains 6.022 * 10^23 atoms (Avogadros number)'

Since 1 mole of Phosphorus  has a mass of  30.974 grams, 21 milligrams has

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3 years ago
Determine the [H3O+] in a 0.265 M HClO solution. The Ka of HClO is 2.9 × 10-8.
dexar [7]

8.8 × 10-5 M is the  [H3O+] concentration in 0.265 M HClO solution.

Explanation:

HClO is a weak acid and does not completely dissociate in water as ions.

the equation of dissociation can be written and ice table to be formed.

 HClO +H2O ⇒ ClO- + H3O+

I  0.265                0        0

C  -x                    +x     +x

E  0.265-x          +x      +x

Now applying the equation of Ka, where Ka is given as 2.9 × 10-8.

Ka = \frac{[ClO-][H3O+]}{[HClO]}

2.9 × 10^-8 = \frac{[x] [x]}{[0.265-x]}

x^{2} = 7.698 x10^{-9}

x = 8.8 × 10-5 M

The hydronium ion concentration is 8.8 × 10-5 M  in 0.265 M solution of HClO.

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