The equivalence factor that should be used is 1/6.022x10^23. This is called the Avogadro's number. It represents the number of
particles in one mole of any substance. This has the value of 6.022 x 10^23 particles /
mole. <span>This number can be used to
convert the number of atoms or molecules into number of moles. </span>
AgNO3(aq) + NaCl(aq) = AgCl(s) + NaNO3
MWt AgNO3 = 169.87; AgCl = 143.32
From the eqn 169.87 g of AgNO3 yield 143.32 g of AgCl
1.000g of AgNO3 yield 143.32/169.87 g of AgCl
Hence 4.27 g will yield (143.32/169.87)×4.27 g of AgCl
= 3.60 g of AgCl which is the theoretical yield.
% yield = (2.56/3.60)× 100 = 71.1%
A skilled chemist (e.g., Marie Curie) would get close to 100%.
Answer: The forensic examination of substances involve a preliminary flame test.
Explanation:
The forensic chemical analysis of samples involves the flame testing which is one of the preliminary test. The materials are burned on a flame and the color of the flame is considered indicative of the elements present in the material.
The substances like Borax (sodium borate), Copper(II) sulfate, and boric acid burn with a characteristic green flame.
They are too small to see with the naked eye