Answer:
3.4 mol Li2SO4
Explanation:
6.8 mol LiOH × (1 mol Li2SO4/2 mol LiOH)
= 3.4 mol Li2SO4
Hydrazine, with a chemical formula of N2H4, has 14 valence electrons. If we draw the Lewis structure of hydrazine, the two N atoms are adjacent while the 4 H atoms surround the N atom at the top and at the side. Since each H is attached to 2 valence electrons, and N is attached to N, a total of 10 valence electrons is already paired. This leaves 2 lone-pairs of valence electrons for each N atom.
Answer:
the density of lithium will be equal to: 0.582 g/cm^3
Explanation:
We have the following data:
a = 430 pm = 4.3x10^-8 cm
molar mass of lithium MM = 6.97 g/mol
Since the cubic cell of lithium is cubic centered in the face, its value of Z will be equal to 4
Avogadro´s number AN = 6.022x10^23 particles/mol
using the following formula we will calculate the density of lithium:
d = (Z*MM)/(a^3*AN) = (4*6.97)/((4.3x10^-8)^3*(6.022x10^23)) = 0.582 g/cm^3