Ming has two unknown substances. One is nonpolar, and the other is polar. Which process would most likely help Ming identify which substance is polar and which is nonpolar?
Test the boiling points. The polar substance should have a lower boiling point because of its dipole-dipole forces.
Test for an odor. The nonpolar substance should have a higher volatility and stronger odor because of its London dispersion forces.
Test the boiling points. The nonpolar substance should have a higher boiling point because of its hydrogen bonds.
Test for an odor. The polar substance should have a higher volatility and weaker odor because of its dipole-dipole forces.

Test for an odor. The nonpolar substance should have a higher volatility and stronger odor because of its London dispersion forces.

Explanation:

To help Ming identify the non-polar compound, assuming the non-polar compound will have an odor test for it and most importantly, the non-polar substance should have a higher volatility due to its London dispersion forces.

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g