B. Label the properties P for physical or C for chemical. ... 1. Silver doesn't react with oxygen.
2. Iron oxides in the presence of oxygen.
3. Diamond is the hardest natural material known to man.
4. Sodium reacts with chlorine to form salt.
A
5. Talcum is a soft mineral.
6. Iron is a denser metal than aluminum.
7. Helium gas doesn't react to the presence of any other substances

pop pop pop on a opp

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.

може ли да зареждате повече информация, моля