Question

I'm sorry for posting in the wrong section but nobody's on for chemistry. How many moles of nitrogen react to produce 1000g of ammonia? WILL MEDAL AND FAN!

Answer 1

Start with the chemical formula of ammonia - NH3

Answer 2

Okay...

Answer 3

Now find the atomic mass of this molecule using the periodic table.

N = 14.0067 g/mole

H = 1.00794 g/mole * 3

Answer 4

17 atomic mass units. The mass of one mole of ammonia is 17g, and the approximate number of moles of ammonia in 1000g of it is 58.824 (that was all given in the problem).

Answer 5

*the problem on the homework

Answer 6

Sorry I'm back. So you want to look at the ratio. 1 mole of ammonia is 1 mole of nitrogen. 14.0067 grams in one mole of ammonia. Because the mole ratio is 1/1 then you would multiply the 14.0067 grams by the 58.824.

Answer 7

I mean 14.0067 grams of nitrogen in one mole of ammonia.

Answer 8

Ooooooohhh... I think I get it.

Answer 9

Thank you SOOO much!

Answer 10

No worries. Let me know if you have any other questions.

Answer 11

Actually I have 2 more chem questions... :)

Answer 12

"Copper is a transition metal which forms to oxides. The chemical formulae of these oxides are:

Cu2O- copper(I) oxide
CuO- copper(II) oxide

The formula and electrical charge of an oxide ion is O^2-.

Deduce the difference between the copper ion in copper(I) oxide and that in copper(II) oxide. Show how you obtained your answer."

Answer 13

I'm not entirely sure what it's asking. Does it want the difference in charge?

Answer 14

I have no idea... I put "The difference is the number of copper atoms- in the copper(I) oxide, there coppers bonded together (Cu2O), where in copper(II) oxide, there is only one atom of copper (CuO)." and got half credit.

Answer 15

Typically with copper(I) and copper(II) they have a charge of +1 and +2 thus giving cu(I)O a -1 charge and cu(II)O a neutral charge. maybe they want the difference of the charges of the copper atoms? Sorry I'm not sure what they're looking for.

Answer 16

I think you're right... I'll probably write my answer and then, "In addition, the copper(I) ion has a +2 charge, and the copper(II) ion has a +1 charge."

Answer 17

I have one more question-

Explain briefly why the following statement is true:

"The higher the pH of the dilute nitric acid the longer it took for the gas syringe to fill with gas."

Answer 18

For that one, I put "Higher pH means lower acidity; the acid will take longer to react with the calcium carbonate, thus filling the syringe more slowly." and got half credit.

*The statement was a conclusion about what happened when calcium carbonate was added to excess dilute nitric acid and gas was given off.

Answer 19

I found this. The overall amount of gas is the same. It is the rate at which the gas is formed which changes.

Answer 20

Right... what it's looking for is why higher pH slows down the rate at which the gas is formed.

Answer 21

I would say when you have an acid that's a higher pH there is less available to titrate with a basic solution so the reaction is slower.

Answer 22

Say again?

Answer 23

when an acid like nitric acid reacts with a base like calcium carbonate, it's called a titration. It's basically where an acid and a base react to eventually reach a neutral ph7. If you have an acid that's at a higher ph then there's not much for it to reach a neutral ph7. That's the only reason I could think that it would slow the reaction down.

Answer 24

I think that the reaction is called neutralization... a titration is "when a solution with a known concentration is used to find the concentration of an unknown solution." Other than that it makes sense.

Answer 25

Thanks for all of your help!

Answer 26

I've heard it both ways. No worries.