Answer:-
1) 6 mol
2) Mo
Explanation: -
Mass of Ozone = 48 g
Chemical formula of ozone = O3
Molar mass of Ozone O 3 = 16 x 3 = 48 g mol-1
Number of moles of ozone = Mass / molar mass
= 48 g / 48 g mol-1
= 1 mol
According to Avogadro’s law, 1 mole of a substance has 6.02 x 10^ 22 molecules.
So 1 mol of O3 has 6.02 x 10^ 22 molecules of ozone.
Now each Ozone molecule has 3 atoms of oxygen.
So, 1 mol of ozone has 3 x 6.02 x 10^22 atoms of oxygen.
Sodium must have 2 x 3 x 6.02 x 10^22 atoms as per the question.
According to Avogadro’s law, 6.02 x 10^ 22 atoms are in 1 mol of sodium
So, for 2 x 3 x 6.02 x 10^22 atoms, there should be (1/ 6.02 x 10^ 22) x 2 x 3 x 6.02 x 10^22
= 6 mol of sodium.
b)
Let the mass of M be m g
Formula of hexafluoride = MF6.
Mass of the hexafluoride = g + 6 x 19
= m + 114
Mass of M=0.250g
Moles of M = 0.250/m
Mass of MF6= 0.547g
Moles of MF6 = 0.547/ (m + 114)
We know 1 mole of M gives 1 mole of MF6.
0.250/m moles of M gives 0.250/m moles of MF6.
But number of moles of MF6 = 0.547/ (m + 114)
Thus
0.250/m = (0.547)/ (m +114))
0.250m + 0.250 x 114 = 0.547m
m = 0.250 x 114 / (0.547 -0.250)
= 96
We see from the given data that Mo is 96.
So M is Mo.
