In sodium chloride, the distance between the center of the sodium ion and the centerof an adjacent chloride ion is 2.819 angstroms. calculate the density in g/cm3of an ideal nacl crystal from this information and what you learned from this lab. hints: to calculate mass, determine how many equivalent ions are in a unit cell. to determinevolume of the unit cell, start by determining the length of on side of the unit cell.

Explanation:

1. Ions per unit cell

(a) Chloride

8 corners + 6 faces

(b) Chloride

12 edges + 1 centre

There are four formula units of NaCl in a unit cell.

2. Mass of unit cell

m = 4 × NaCl = 4 × 58.44 u = 233.76 u

3. Volume of unit cell

(a) Edge length

(b) Volume

4. Density

n+h→nh3

we must remember that nitrogen and hydrogen are both diatomic molecules in their standard gas form. this adjusts the equation to

n2+h2→nh3

now we need to adjust coefficients in order to balance the atoms on each side of the equation. currently we have 2 atoms of nitrogen and 2 atoms of hydrogen on the reactant side and 1 atom of nitrogen and 3 atoms of hydrogen on the product side.

we can balance the hydrogens by placing a coefficient of 2 in front of ammonia and a coefficient of 3 in front of the hydrogen.

n2+3h2→2nh3

this gives us 6 hydrogen on each side and coincidentally the nitrogens now equal 2 on each side.

it would be d. henry moseley

hope this !

and sorry if i'm late. have a good rest of your day! : d