The forensic technician at a crime scene has just prepared a luminol stock solution by adding 15.0 g of luminol into a total vol
ume of 75.0 mL of H2O. What is the molarity of the stock solution of luminol? Express your answer with the appropriate units.
1 answer:
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Answer:- molecules.
Solution:- The grams of tetrabromomethane are given and it asks to calculate the number of molecules.
It is a two step unit conversion problem. In the first step, grams are converted to moles on dividing the grams by molar mass.
In second step, the moles are converted to molecules on multiplying by Avogadro number.
Molar mass of = 12+4(79.9) = 331.6 g per mol
let's make the set up using dimensional analysis:
= molecules
So, there will be molecules in 250 grams of
.