How many molecules of ammonia are produced from: 2.58x10^-4g of Hydrogen?
My balanced equation:
3H2 + N2 = 2NH3
I worked this question as:
mol of H = 2.58x10^-4g/1.00794g/mol=
2.559676x10^-4 mol
mol of NH3 produced = 2x2.559676x10^-4mol/3mol NH3 = 1.706450701x10^-4
Molecules = 1.706450701x10^-4 x 6.023x10^23
= 1.027x10^20 molecules. I entered 1.03x10^20molecules & got it completely incorrect!!!
What did I do wrong?!! Am I way off?!
mols H2 = 2.58*10^-4/2 (not 1).
The process for conversion to mols NH3 is ok. I think you answer is just twice what it should be.
Try that and see how it goes. If you still have trouble, post your new work and we will gladly help you through it.
By the way, I think you are carrying far too many digits. I usually carry one more than I am "allowed" which would mean 4 places since your first number is 2.58*10^-4.
THIS time I got it correct!
answer = 5.13x10^-19 molecules!
THANK YOU soooo much!!
I only had 2 attempts remaining!
I will help you understand what went wrong with your calculation. It seems that you made a correct calculation up until the point of determining the number of moles of NH3 produced. However, there is a mistake in the final step where you calculated the number of molecules.
Let's analyze step by step:
1. You correctly calculated the number of moles of hydrogen (H) using the formula:
moles of H = mass of H / molar mass of H
moles of H = 2.58x10^-4 g / 1.00794 g/mol
= 2.559676x10^-4 mol (which is correct)
2. Next, you correctly determined the moles of NH3 produced using the balanced equation:
moles of NH3 produced = (2/3) * moles of H
moles of NH3 produced = (2/3) * 2.559676x10^-4 mol
= 1.706450701x10^-4 mol (which is correct)
Now, let's focus on the last step where you calculated the number of molecules.
3. To calculate the number of molecules, you should multiply the number of moles by Avogadro's number (6.022x10^23 molecules/mol). However, it seems that you made a slight error in this calculation.
molecules = moles of NH3 produced * Avogadro's number
molecules = 1.706450701x10^-4 mol * 6.022x10^23 molecules/mol
= 1.027x10^20 molecules (which is correct)
Based on your calculations, you obtained the correct answer of 1.027x10^20 molecules of ammonia. It seems that you inadvertently rounded the answer to 1.03x10^20 molecules and entered that value, resulting in the incorrect response.
To avoid such errors in the future, it is essential to ensure accurate rounding and precision in calculations.