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2 years ago

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Which describes the flow of energy in a food chain? (Which food chain makes sense) A. Sun-->Grass-->Mouse-->Snake B. Gr

ass-->Mouse-->Snake-->Sun C. Snake-->Sun-->Grass-->Mouse D. Mouse-->Snake-->Sun-->Grass

1 answer:

zheka24 [161]2 years ago

4 0

A. would be the best answer to the question

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What is ΔG° at 298 K for the following equilibrium? Ag+(aq) + 2NH3(aq) Ag(NH3)2+(aq); Kf = 1.7 × 107 at 298 K a. 41 kJ b. 0 c. –

jekas [21]

Answer:

ΔG° = 41.248 KJ/mol (298 K); the correct answer is a) 41 KJ

Explanation:

Ag+(aq) + 2NH3(aq) ↔ Ag(NH3)2+(aq)

⇒ Kf = 1.7 E7; T =298K

⇒ ΔG° = - RT Ln Kf.....for aqueous solutions

∴ R = 8.314 J/mol.K

⇒ ΔG° = - ( 8.314 J/mol.K ) * ( 278 K ) ln ( 1.7 E7 )

⇒ ΔG° = 41248.41 J/mol * ( KJ / 1000J )

⇒ ΔG° = 41.248 KJ/mol

7 0

2 years ago

Read 2 more answers

If the empirical formula of a compound is C2H5 and the Molecular mass is 87g/mol what is the molecular formula?

frez [133]

C6H15, C2H5 has a molar mass of 29g/mol. 87 divided by 29 is 3. Then multiply each element subscript by 3

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3 years ago

Ammonia, NH3 is a common base with Kb of 1.8 X 10-5. For a solution of 0.150 M NH3:

Vesnalui [34]

The concentrations : 0.15 M

pH=11.21

<h3>Further explanation</h3>

The ionization of ammonia in water :

NH₃+H₂O⇒NH₄OH

NH₃+H₂O⇒NH₄⁺ + OH⁻

The concentrations of all species present in the solution = 0.15 M

Kb=1.8 x 10⁻⁵

M=0.15

$\tt [OH^-]=\sqrt{Kb.M}\\\\(OH^-]=\sqrt{1.8\times 10^{-5}\times 0.15}\\\\(OH^-]=\sqrt{2.7\times 10^{-6}}=1.64\times 10^{-3}$

$\tt pOH=-log[OH^-]\\\\pOH=3-log~1.64=2.79\\\\pH=14-2.79=11.21$

8 0

2 years ago

Please help me with this

Sophie [7]

Answer:

5.0 38 84.0 749.7 528.0 729.0 738.9 739.0

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1 year ago

The electron configuration for aluminum (Al) is shown below:

Serjik [45]

Answer:

It is the third choice

Explanation:

Just did assignment

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3 years ago