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Brilliant_brown [7]
3 years ago
10

Sterling silver contains 92.5% silver and 7.5% copper. A sterling silver dish weighs 185.0 g. What mass of copper is in the dish

?
Chemistry
2 answers:
lord [1]3 years ago
6 0

Answer:

I believe the answer is 14g

elena-14-01-66 [18.8K]3 years ago
5 0

<u>Answer:</u> The mass of copper in the dish is 13.875 grams.

<u>Explanation:</u>

We are given:

(m/m) % of copper = 7.5 %

This means that 7.5 grams of copper are present in 100 grams of solution.

We need to find the mass of copper in 185 grams of sterling silver dish.

To calculate the mass of copper, we use unitary method, we get:

In 100 g of sterling silver dish, the mass of copper is 7.5 grams.

So, in 185 grams of sterling silver dish, the mass of copper is = \frac{7.5g}{100g}\times 185g=13.875g

Hence, the mass of copper in the dish is 13.875 grams.

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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

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\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

<u>For a given chemical reaction if-</u>

1. ΔG = negative and E°cell = positive

⇒ <em>The reaction is spontaneous and proceeds spontaneously in the forward direction.</em>

2.  ΔG = positive and E°cell = negative

⇒ <em>The reaction is non-spontaneous and proceeds spontaneously in the reverse direction.</em>

<u>Since, for this chemical reaction: </u>

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

<u>Therefore, this reaction is spontaneous in the reverse direction.</u>

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1 liter = 1000 grams

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