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3 years ago

Many mountains on Earth have been formed by the eruption of __________.

Chemistry

2 answers:

inna [77]3 years ago

5 0

The answer is c. Volcanoes

inysia [295]3 years ago

3 0

Answer:

It is C. Volcanoes

Explanation:

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How many moles in 250g of CBr 4

EleoNora [17]

Answer:

fzdfxbgfdgbfbfggf

Explanation: fregrgsrg5

7 0

3 years ago

Calculate the molality, molarity, and mole fraction of FeCl3 in a 29.5 mass % aqueous solution (d = 1.283 g/mL).

faltersainse [42]

Answer:

molality FeCl3= 2.579 molal

molarity FeCl3 = 2.333 M

mol fraction FeCl3 = 0.0444

Explanation:

Step 1: Data given

Mass % = 29.5 %

Density = 1.283 g/mL

Molar mass FeCl3 = 162.2 g/mol

Step 2: Calculate mass solution

Suppose we have 1L = 1000 mL solution

Mass solution = 1.283 g/mL * 1000 mL = 1283 grams

Step 3: Calculate mass FeCl3

Mass FeCl3 = 0.295 * 1283 grams

Mass FeCl3 = 378.485 grams

Step 4: Calculate mass of water

Mass water = 1283 - 378.485 = 904.515 grams

Step 5: Calculate moles FeCl3

Moles FeCl3 = mass FeCl3 / molar mass FeCl3

Moles FeCl3 = 378.485 grams / 162.2 g/mol

Moles FeCl3 = 2.333 moles

Step 6: Calculate moles H2O

Moles H2O = 904.515 grams / 18.02 g/mol

Moles H2O = 50.195 moles

Step 7: Mol fraction FeCl3

Mol fraction FeCl3 = 2.333 / (50.195+2.333)

Mol fraction FeCl3 = 0.0444

Step 8: Calculate molality

Molality = moles FeCl3 / mass H2O

Molality = 2.333 moles / 0.904515 kg

Molality = 2.579 molal

Step 9: Calculate molarity

Molarity = moles / volume

Molarity FeCl3 = 2.333 moles / 1 L

Molarity FeCl3 = 2.333 M

8 0

3 years ago

How to solve for K when given your anode and cathode equations and voltage

Aleks04 [339]

Answer:

See Explanation

Explanation:

In thermodynamics theory the Free Energy (ΔG) of a chemical system is described by the expression ΔG = ΔG° + RTlnQ. When chemical system is at equilibrium ΔG = 0. Substituting into the system expression gives ...

0 = ΔG° + RTlnKc, which rearranges to ΔG° = - RTlnKc. ΔG° in electrochemical terms gives ΔG° = - nFE°, where n = charge transfer, F = Faraday Constant = 96,500 amp·sec and E° = Standard Reduction Potential of the electrochemical system of interest.

Substituting into the ΔG° expression above gives

-nFE°(cell) = -RTlnKc => E°(cell) = (-RT/-nF)lnKc = (2.303·R·T/n·F)logKc

=> E°(cell) = (0.0592/n)logKc = E°(Reduction) - E°(Oxidation)

Application example:

Calculate the Kc value for a Zinc/Copper electrochemical cell.

Zn° => Zn⁺² + 2e⁻ ; E°(Zn) = -0.76 volt

Cu° => Cu⁺² + 2e⁻ ; E°(Cu) = 0.34 volt

By natural process, charge transfer occurs from the more negative reduction potential to the more positive reduction potential.

That is,

Zn° => Zn⁺² + 2e⁻ (Oxidation Rxn)

Cu⁺² + 2e⁻ => Cu° (Reduction Rxn)

E°(Zn/Cu) = (0.0592/n)logKc

= (0.0592/2)logKc = E°(Cu) - E°(Zn) = 0.34v - (-0.76v) = 1.10v

=> logKc = 2(1.10)/0.0592 = 37.2

=> Kc = 10³⁷°² = 1.45 x 10³⁷

3 0

3 years ago

Agree or disagree with which one and provide evidence thank you!!!!!!!:)

forsale [732]

Answer:number 2

Explanation:

the definition of photosynthesis is that carbon dioxide and water changes into sugar and oxygen

3 0

3 years ago

Read 2 more answers

0.836 m

Nataly_w [17]

The force exerted on the Kite is 49.6 N.

<u>Explanation:</u>

Force is nothing but the product of pressure exerted by the wind on the kite and the area of the kite.

F = P × A

Where,

F is the Force in Newton = ?

P is the Pressure = 113 Pa = 113 N/m²

A is the Area of the Kite

A = 0.836 m × 0.525 m = 0.4389 m²

Now, we can find the force as,

F = 113 N/m² × 0.4389 m²

= 49.6 N [ ∵ In the units, m² gets cancelled]

So the force exerted on the Kite is 49.6 N.

6 0

3 years ago