Answer:
True
Explanation:
Crown ethers are macrocyclic Organic compounds having oxygen atoms inside a chian of carbon atoms.
Crown ethers are of great importance in coordination chemistry because, the lone pairs on oxygen atoms could coordinate metal ions thereby sequestering them from aqueous solutions.
It has 9 protons, 9 electrons and 10 neutrons.
No units are provided in the data table, though one would usually assume that 0.244 is molarity of NaOH, and buret data of 14.7 is probably the final volume of NaOH in mL. No identification is given for the 38, but maybe this is the initial buret volume in mL.
If the buret was rinsed with water, it should have been left to dry for some time, or else the added water may slightly dilute the NaOH solution placed in it.
Answer:
The ionic compound NaCl has a Face Centered Cubic unit cell
The site for atoms are Face, center and Edges corner.
Effective number of atoms
Na+
1centers + 12edges x
= 4 Na+
Cl-
6face x
+ 
x8 corners = 4Cl-
This is just one unit cell effective atom, there are thousand's of such unit cells are combined to form one such structure of NaCl. The real formula of NaCl is Na4Cl4 but for simplicity we use empirical formula that is NaCl.
