Cu⇒ 1 atom
N⇒2 atoms
O⇒6 atoms
Total 9 atoms
<h3>Further explanation </h3>
The empirical formula is the smallest comparison of atoms of compound forming elements.
A molecular formula is a formula that shows the number of atomic elements that make up a compound.
<em>(empirical formula) n = molecular formula </em>
Chemical formula : Cu(NO₃)₂
Number of Cu : 1
Number of N : 2
Number of O = 2 x 3 = 6
Total atoms in Cu(NO₃)₂ : 1 + 2 + 6 = 9
You will feel way better because in our class we learned that lukewarm baths are good for fevers and warm washcloths :)
Higher value- mass number
Lower value- atomic number/ number of proton
Answer:
![\boxed{Percentage \ Yield = 47.6 \ percent}](https://tex.z-dn.net/?f=%5Cboxed%7BPercentage%20%5C%20Yield%20%3D%2047.6%20%5C%20percent%7D)
Explanation:
The balanced chemical reaction is
![2Li + 2H_{2}O \ \ \ -> \ \ \ 2LiOH + H_{2}](https://tex.z-dn.net/?f=2Li%20%2B%202H_%7B2%7DO%20%5C%20%5C%20%5C%20-%3E%20%20%5C%20%5C%20%5C%202LiOH%20%2B%20H_%7B2%7D)
For the balanced reaction, we've
Lithium = 14 g
Water = 36 g
LiOH = 48 g
Hydrogen gas = 2 g
So,
14 g of lithium = 48 g of lithium hydroxide
And we have:
7.40 g of lithium = x grams of lithium hydroxide
Cross Multiplying,
x grams = ![\frac{48*7.4}{14}](https://tex.z-dn.net/?f=%5Cfrac%7B48%2A7.4%7D%7B14%7D)
Grams of lithium = 25.4 g of lithium hydroxide
So, Theoretical Yield = 25.4 g of lithium hydroxide
Now, The %age yield:
%age Yield = ![\frac{Actual \ Yield}{Theoretical \ Yeild } * 100](https://tex.z-dn.net/?f=%5Cfrac%7BActual%20%5C%20Yield%7D%7BTheoretical%20%5C%20Yeild%20%7D%20%2A%20100)
%age Yield = ![\frac{12.1}{25.4} * 100](https://tex.z-dn.net/?f=%5Cfrac%7B12.1%7D%7B25.4%7D%20%2A%20100)
%age Yield = 47.6%
C. 115 is your best answer
There are 118 elements in the Periodic Table
hope this helps