What is the formula for Ammonium Sulfide?

[Quincy]

Homework Statement

Write the formula for Ammonium Sulfide

Homework Equations

NH4^+ = ammonium

S^2- = Sulfur

The Attempt at a Solution

NH4^+2S

 

[CompuChip]

How many of each do you need to get something neutral?
Does 1 NH4 and 2 S have total charge 0?

 

[Borek]

Quincy: final formula won't have charge inside. Could be you did OK, but ^+ are of no use here.

Try to format your formula properly using [ sub][ /sub] and [ sup][ /sup] tags (without spaces):

NH[ sub]4[ /sub][ sup]+[ /sup] = NH₄⁺

 

[Quincy]

Homework Statement

Calculate the percentage composition of Silver (I) Oxide

Silver's atomic mass: 107.87

Oxygen's atomic mass: 16

The Attempt at a Solution

Molecular mass: 123.87

(107.87/123.87) * 100 = 87.08% = Percent composition for Silver

(16/123.87) * 100 = 12.92% = Percent composition for Oxygen

 

[Borek]

You are half OK and half wrong. Approach is correct, but molar mass is wrong.

What is formula of the silver (I) oxide?

 

[Quincy]

You are half OK and half wrong. Approach is correct, but molar mass is wrong.

What is formula of the silver (I) oxide?

Ag₂O?

 

[Borek]

Yes, so what is the molar mass?

 

[Quincy]

molar mass = 231.74?

percent comp of Silver = (215.74/231.74) * 100 = 93.10%?

percent comp of Oxygen = (16/231.74) * 100 = 6.90%?

 

[Borek]

3*ok

 

[Quincy]

P₄S₁₀ -- Phosphorus Sulfide?
Hg₂O₂ -- Mercury Oxide? -- and shouldn't the formula be HgO?...

 

[Borek]

Check phosphorus sulfide article in wikipedia. Your answer is correct, but reality is much more complicated.

If Hg₂O₂ is HgO, same trick should be done to P₄O₁₀, converting it to P₂O₅. However, we know for sure that single molecule of these compounds is larger then its experimental formula shows.