# Calc % Ag in Alloy: 0.6353g Ag2/ 0.5000g alloy x 100% = 12.9%

• orchidee7
You can solve for the mass of CuS and Ag2S using the given information and then use the mass of Ag2S to calculate the percentage of Ag in the alloy. In summary, the mass of Ag2S is 0.7300 grams, which is equivalent to 0.6353 grams of Ag. This means that the alloy contains 12.9% Ag.
orchidee7

## Homework Statement

An alloy of copper and silver weighing 0.5000 grams is dissolved in HNO3 and treated with H2S to precipitate both CuS and Ag2S. It is found that the solid sulphides weigh 0.7300 grams. Calculate the percentage of Ag in the alloy. (12.9 %)

2Ag+(aq) + H2S(aq)→ Ag2S(s) + 2H+(aq)
Cu+2(aq) + H2S(aq)→ CuS(s) + 2H+(aq)

## Homework Equations

mass of Ag/mass of alloy = % of Ag

## The Attempt at a Solution

I'm not too sure how to start this question…

So far, I have

0.7300 g Ag2S x 1 mol / 215.74 g Ag2
= 2.945 x 10-3 mol Ag2S

2.945 x 10-3 mol Ag2S x 215.74 g Ag2/ 1 mol Ag2S
= 0.6353 g Ag2I'm not sure if I'm on the right track here?

You have a system of two equations in two unknowns.

## What is the formula for calculating the percentage of Ag in an alloy?

The formula for calculating the percentage of Ag in an alloy is:
(Weight of Ag in alloy / Weight of alloy) x 100%

## How do I calculate the weight of Ag in an alloy?

To calculate the weight of Ag in an alloy, you will need to know the weight of the alloy and the percentage of Ag in the alloy. You can then use the formula:
Weight of Ag in alloy = (Percentage of Ag in alloy / 100) x Weight of alloy

## What is the significance of calculating the percentage of Ag in an alloy?

Calculating the percentage of Ag in an alloy is important for determining the quality and composition of the alloy. It can also help in identifying any impurities or variations in the alloy composition.

## What units should I use for the weight of Ag and the weight of the alloy?

The weight of Ag and the weight of the alloy should be in the same units, such as grams or ounces, for accurate calculations.

## Can I use this formula for calculating the percentage of other elements in an alloy?

Yes, this formula can be used for calculating the percentage of any element in an alloy, as long as you have the weight of the element and the weight of the alloy.

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