Silver is widely used in jewellery and for tableware...?

Question

Silver is widely used in jewellery and for tableware. Although the metal is highly resistant to oxidation by air at ordinary temperatures, it becomes tarnished when exposed to air containing small amounts of hydrogen sulphide. The tarnish is a layer of silver sulphide. The overall reaction is:

4 Ag + 2 H2S --> 2 Ag2S + 2 H2O

What mass of silver sulphide would form from the reaction of 0.015 g of silver?

Any help would be appreciated. Thanks.

Answer 1

Find fraction of silver in Ag2S, take inverse, make proportion and use to calculate corresponding wt of product:

[(2 x 107.9g/mol) + 32g/mol]/(2 x 107.9g/mol) = Xg/0.015g

Solve for X: [247.8/215.8] x 0.015g = 0.0172g Ag2S

I am revisiting this problem as every body who does it is getting a different answer!

First, if you have 0.015g of silver and you are ADDING sulfur to it, how can the resulting silver sulfide weigh LESS than the starting weight of the original silver!

(The equation does not show any silver-containing byproducts, where some could get lost).

We will do this in reverse!: Lets calculate the weight of silver in 0.0172g of Ag2S: (the answer I had)

(2 X 107.9g/mol)/[(2 x 107.9g/mol) + 32g/mol] x 0.0172g

215.8/247.8 x 0.0172g = 0.015g

Answer 2

As you can see from the reaction, 4 moles of silver would react giving 2 moles of silver-sulphide.
M(Ag) = 108g/mol
M(Ag2S) = 140g/mol
so:
4*108 moles Ag ---- 2*140 moles Ag2S
0.015g ---- X

X = [0.015*2*140] / [4*108]
X = 0.00972222g of Ag2S

Answer 3

The balanced equation is 4Ag + 2H2S + 2O2 ===> 2Ag2S + 2H2O
0.015gAg x 1molAg/108gAg x 2molAg2S/4molAg x 172gAg2S/1molAg2S = (0.015)(2)(172)/(108)(4) = 0.012g Ag2S to two significant figures.

Answer 4

honestly, something DID style silver. A supernova explosion. Stars are fueled via changing Hydrogen into helium with the aid of fusion. whilst the famous individual is honestly extensive it burns swifter, and makes extra helium, then runs enormously plenty out of hydrogen. Then it starts off to fuse Helium into heavier and heavier aspects. This retains the famous individual shining, yet motives very much extra warmth. finally Fusion reaches Iron, and Iron it the heaviest factor which may be made on the pressures interior a famous individual. the interior the famous individual starts off to kick back, inflicting the shell to settlement and then rebound, ripping the famous individual aside in a great explosion. This explosion fuses iron and aspects heavier than Iron. the previous answer additionally covers the style you're making stuff out of it, if that develop into what you meant via formed.

Answer 5

Use silver polish containing tolyltriazole. It lays down a monomolecular sorbed layer that renders the silver surface inert to sulfide absent mechanical breach.

As for the other problem, grams to moles to moles to grams.