D) Manganese (VII) oxide עו
CHAPTER REVIEW QUESTIONS
Is are
ompound
Answer the following questions
1. What is the difference between atoms and molecules?
2. Why are elements classified into metals, non-metals and
metalloids?
3. What is the difference between chemical symbol and chemical
formula? Give example for each of them.
4. List the symbols for the following elements: Iron, Sodium,
Antimony, Tungsten. Explain why these symbols do not correspond
to the English names of the elements.​

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.