Covalent network solids typically have __ melting points and __ boiling points. the chemical formula of a network solid indicates choices on 1st and second blank are: high/low. choices on the last are: only the types of atoms/ the actual number of atoms/ the ratio of the types of atoms

The first two are high and im not sure about the last one but it is for sure not only types of atoms hope this helps you out.

Explanation:

The frist 2 are high

The last one is the ratio of the types of atoms

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