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3 years ago

Write the mole ratio of (Mg+2HF➡MgF+H2)

Chemistry

1 answer:

iragen [17]3 years ago

4 0

Just add 2 in front of the right side equation Mg+2HF-2MgF+H2

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The free energy change for the following reaction at 25 °C, when [Cr3+] = 1.32×10-3 M and [Fe3+] = 1.14 M, is 131 kJ: Cr3+(1.32×

larisa [96]

Answer:

E°cell = - 1.3575 V

This reaction is spontaneous in the reverse direction

Explanation:

The given cell reaction:

Cr³⁺(1.32 × 10⁻³ M) + Fe²⁺(aq) → Cr²⁺(aq) + Fe³⁺(1.14 M)

The given Gibbs free energy: ΔG = 131 kJ = 131 × 10³ J (∵ 1 kJ = 10³ J)

As we know,

ΔG = - n F E°cell

Here, n - the number of moles of electrons transferred = 1

F - Faraday constant = 96500

E°cell - cell potential = ?

$\therefore E^{\circ }_{cell} = -\frac{\Delta G}{n \: F} = -\frac{131\times 10^{3}\, J}{1\, mol\times96500 \, C.mol^{-1}}$

$\Rightarrow E^{\circ }_{cell} = -1.3575\, V$

For a given chemical reaction if-

1. ΔG = negative and E°cell = positive

⇒ The reaction is spontaneous and proceeds spontaneously in the forward direction.

2. ΔG = positive and E°cell = negative

⇒ The reaction is non-spontaneous and proceeds spontaneously in the reverse direction.

Since, for this chemical reaction: 

Cr³⁺(1.32 × 10⁻³ M) + Fe²⁺(aq) → Cr²⁺(aq) + Fe³⁺(1.14 M)

ΔG = + 131 × 10³ J ⇒ positive

and, E°cell = - 1.3575 V ⇒ negative

Therefore, this reaction is spontaneous in the reverse direction.

6 0

3 years ago

How many carbon atoms are present in a mole of 12C?

kondor19780726 [428]

1 mol of carbon 12 would possess 6.02 X 10^23 carbon atoms.

6 0

3 years ago

A student obtained 2.00 g of pure caffeine following recrystallization from a crude sample, which originally weighed 2.56 g. Wha

Lady_Fox [76]

Answer: 78.125%

Explanation:

From the question, we are informed that a student obtained 2.00g of pure caffeine following recrystallization from a crude sample, which originally weighed 2.56g.

The percent recovery of pure caffeine from crude will be calculated as:

= Mass of pure caffeine / Mass of crude sample × 100

= 2.00 / 2.56 × 100

= 78.125%

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3 years ago

How does the structure of water molecules account for adhesion.

elena-14-01-66 [18.8K]

Answer:

The attraction of the polar water molecules for other molecules

Explanation:

3 0

3 years ago

Which substance is most soluble in water? 1) (NH4)3PO4 2)Cu(OH)2 3) AG2SO4 4) CACO3

Rzqust [24]

The most soluble of the compounds given above is [NH4]3PO4. [NH4]3PO4 is a salt of ammonium and phosphate; it is a white crystal at room temprature. It is an highly unstable compound and thus easily decompose when mixed with water.

8 0

3 years ago