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which of the following chemical formulas shows a covalent compound?

nacl

hbr

mgo

co2

Explanation:

A covalent compound is generally formed by non-metals.

For example, in HBr compound both hydrogen and bromine are non-metals. Whereas in compound also both carbon and oxygen atoms are non-metals.

For example, NaCl and MgO are both ionic compounds.

An ionic compound is always formed between a metal and a non-metal.

Thus, we acn conclude that out of the given options HBr and chemical formulas shows a covalent compound.

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

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.