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dem82 [27]
3 years ago
9

When ch4(g) reacts with h2o(g) to form h2(g) and co(g), 206 kj of energy are absorbed for each mole of ch4(g) that reacts. write

a balanced thermochemical equation for the reaction with an energy term in kj as part of the equation. note that the answer box for the energy term is case sensitive. use the smallest integer coefficients possible and put the energy term in the last box on the appropriate side of the equation. if a box is not needed, leave it blank. + + + +?
Chemistry
1 answer:
jeka57 [31]3 years ago
7 0
1) Chemical reaction: CH₄ + H₂O → 3H₂ + CO ΔH = + 206 kJ/mol.
2) Chemical reaction: CO + H₂O → CO₂ + H₂, ΔH = + 2,8 kJ/mol.
3) Chemical reaction: CH₄ + 2O₂ → CO₂ + 2H₂O ΔH = -802 kJ/mol.
4) Chemical reaction: 2H₂ + O₂ → 2H₂O ΔH = 2·(-242 kJ7mol) = - 484 kJ/mol.
Endothermic reaction (ΔH>o) and exothermic reaction (ΔH<span><0).</span>
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ikadub [295]

Answer: The correct option is 2.

Explanation: Group 15 elements are Nitrogen, phosphorous, Arsenic, Antimony, Bismuth.

To know whether an element exits as a diatomic molecule or not, we look at the atomicity of an element.

Atomicity is the number of atoms of an element combining to form a molecule.

Atomicity of Nitrogen = 2

Atomicity of Phosphorous = 4

Atomicity of Bismuth = 1

Atomicity of Arsenic = 1

The element having atomicity 2 will exist as a diatomic molecule.

Hence, Nitrogen is a diatomic molecule (N_2)

4 0
3 years ago
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The acid-dissociation constant of hydrocyanic acid (hcn) at 25.0 °c is 4.9 ⋅ 10−10. what is the ph of an aqueous solution of 0.0
vodomira [7]
According to the reaction equation:

and by using ICE table:

              CN-  + H2O ↔ HCN  + OH- 

initial  0.08                        0          0

change -X                        +X          +X

Equ    (0.08-X)                    X            X

so from the equilibrium equation, we can get Ka expression

when Ka = [HCN] [OH-]/[CN-]

when Ka = Kw/Kb

               = (1 x 10^-14) / (4.9 x 10^-10)

               = 2 x 10^-5

So, by substitution:

2 x 10^-5 = X^2 / (0.08 - X)

X= 0.0013

∴ [OH] = X = 0.0013 

∴ POH = -㏒[OH]

            = -㏒0.0013

            = 2.886 

∴ PH = 14 - POH

         = 14 - 2.886 = 11.11
5 0
3 years ago
Rank these elements according to first ionization kr, br, se, as, ge, ga, ca, k
riadik2000 [5.3K]
<span>Kr> Br> As> Se> Ge> Ca> Ga > K </span>
6 0
3 years ago
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vladimir1956 [14]

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Graphite is different from other allotropes of carbon because the carbon atoms in graphite are arranged in widely spaced layers. Graphite and diamond are the two main allotropes of carbon that are closely related.

  • Both allotropes forms under extreme temperature and pressure. In geology, they are categorized as derivatives of changed rocks.
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diamond brainly.com/question/10515084

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8 0
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elena-14-01-66 [18.8K]

Answer:

No.

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