Ikind of get how to do this but don’t fully #’s 2, 3, and 4

2. 109 g NaCl

3. 31.9 g ZnCl2

4. 15.4 g Al2O3

Explanation: First find moles of the given compound

Next do the mole ratio between both compounds

Convert moles to mass.

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

i believe the answer is a.