thank you so much, you're a life saver. such a streamlined and easy to follow explanation. wish you were my chemistry professor

@AnneSchmidt

3 жыл бұрын

Outstanding. Glad the video was helpful!

Great video! Very thorough!

@AnneSchmidt

5 жыл бұрын

Anita Falade thank you! Glad it helped:)

Thank you. Now I am wondering about the reverse -- if I am given a number of ions of Cl in the ionic compound MgCl2, how do I calculate how many grams we would of the compound itself for the number of ions given?

@AnneSchmidt

5 жыл бұрын

Great question! This kind of problem usually is really hard for students. Here is an example and work for you to try: If you have 4.32e24 Cl- ions how many grams of MgCl2 is possible? First you would divide by 2 ions of Cl- (1 f.u. MgCl2 is in the numerator). Then you would divide by 6.02e23 f.u. MgCl2 (1 mole MgCl2 is in the numerator). Then you would multiply by 95.21 g MgCl2 (1 mole MgCl2 is in the denominator). The answer is 342 g MgCl2. Basically you have three conversions again, but in the reverse order and the numerator and denominators are flipped. Hope this helps!

@theotelos9188

5 жыл бұрын

@@AnneSchmidt Thank you so much for the prompt reply!

@alderamin1402

2 жыл бұрын

@@AnneSchmidt thank you very much I like this question

@AnneSchmidt

2 жыл бұрын

@@alderamin1402 outstanding 😃

@fabihanazat6200

2 жыл бұрын

@@AnneSchmidt (1 f.u MgCl2/2 ions Cl-)x(1mol MgCl2/6.02x10^23 f.u MgCl2)x(95.21g MgCl2/1 mol MgCl2) is what I punched into my calculator according to your instructions. However, I did not recieve 342 g as an answer. Could you perhaps clarify? Thanks in advance! Note: I did not include the brackets when putting it into my calculator, I just included the brackets here so it'd be easier for you to understand :)

such amazing work, very neat.

@AnneSchmidt

9 ай бұрын

Thank you!

If the question were to ask for the total number of ions would the last part then be written as 3 ions/1 f.u. Cu(No3)2

@AnneSchmidt

3 жыл бұрын

Sure would! Good job.

If we have to calculate total ions in NH3 then we multiply the number of molecules by 6?

@AnneSchmidt

3 жыл бұрын

No ammonia is a molecule. It does have 4 atoms though.

you are an angel, thank you so much

@AnneSchmidt

Жыл бұрын

Aww ☺️ thanks! Happy to help.

Could I change the last 2 conversion factors to solve this problem? I got the same result. I did it like that: 2 mol nitrate / 1 mol Copper (ll) nitrate x 6.02x10²³ nitrate ions/ 1 mol nitrate Is it true?

@AnneSchmidt

2 жыл бұрын

Yes! Those are valid and correct conversions.

@alderamin1402

2 жыл бұрын

@@AnneSchmidt thank you for your quick answer 💜💜💜

in this case is the # of FU equal to the # of Cu atoms ?

@AnneSchmidt

5 жыл бұрын

Yes it is. Since every FU of Copper (II) Nitrate contains only one copper atom.

Thank You

@AnneSchmidt

2 жыл бұрын

You are very welcome Raza!

this helped so much

@AnneSchmidt

3 жыл бұрын

Super! Glad I helped you.

Do we solve it the same way if they asked for nitrogen atoms?

@AnneSchmidt

4 жыл бұрын

Nitrate is an ion, not atom so maybe if you were asked to find nitrogen atoms you would have the same numerical answer, but a different label. This is because there are two nitrogen atoms in one formula unit of copper (II) nitrate. Also, if you were asked to find the number of oxygen atoms, then you would need the last step of the stoichiometry problem to be multiplied by 6 atoms of oxygen for every 1 formula unit.

@maggie206

4 жыл бұрын

Anne Schmidt thank you! I meant nitrogen

Very helpful

@AnneSchmidt

6 жыл бұрын

Thanks! Glad it helped you.

Thank you From 🇮🇳

@AnneSchmidt

3 жыл бұрын

You are very welcome!

It's a good video ..👍

@AnneSchmidt

4 жыл бұрын

Thanks 😊

Make sure u start with something easy first, but overall it was ok

@AnneSchmidt

5 жыл бұрын

Thanks

thanks luv

@AnneSchmidt

3 жыл бұрын

👍🏻😊

Me just strting to learn abt moles , my brain is just fried right now

Thank you 😭♥️

@AnneSchmidt

3 жыл бұрын

You are very welcome! Happy to help.

this didnt help could you do one with a compound with x amount of g to the number of ions of am element in the compound? please.

Thank you so much! But could you just use normal formulas instead of the table next time

@AnneSchmidt

5 жыл бұрын

Do you mean the table to write the formula for copper (II) nitrate? I have seen students write the formula wrong and then get the molar mass wrong and then get the answer wrong.

@hlokomani

5 жыл бұрын

Anne Schmidt noo mam’ not that one, the one where you put Avogadro’s number

@AnneSchmidt

5 жыл бұрын

HK now I think I understand. I recently switched to a “fence post” or “table” method of showing stoichiometry but it is no different then showing lines and x between (or using parentheses). It’s just easier digitally to create “table” stoichiometry instead of fractions with x’s (times) between.

@hlokomani

5 жыл бұрын

Anne Schmidt cool perspective. Thanks for taking the time to actually reply to me. Really appreciate it

@AnneSchmidt

5 жыл бұрын

HK you are very welcome! Subscribe 👍🏻😃

Omg she is smart

@AnneSchmidt

3 жыл бұрын

Thanks!