Asolid compound in a sealed container was kept at a very low temperature in a freezer. when placed at room temperature, the substance quickly turned into a liquid. this compound is most likely which of the following?
a. an ionic compound because it has a low boiling point
b. a covalent compound because it has a low boiling point
c. an ionic compound because it has a low melting point
d. a covalent compound because it has a low melting point

A solid compound in a sealed container is a covalent compound because it has a low melting point.

Explanation:

Ionic compounds have strong electrostatic forces which are strong in nature and cannot be broken down at low temperature.

Whereas covalent compounds have Vanderwaal forces which are weak in nature. Therefore, covalent compounds melts at low temperature.

Thus, it can be concluded that a solid compound in a sealed container is a covalent compound because it has a low melting point.

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