In the nitrite ion (NO2-), . A) both bonds are single bonds B) both bonds are double bonds C) one bond is a double bond and the other is a single bond D) both bonds are the same E) there are 20 valence electrons

B) Both bonds are double bonds

Explanation:

For nitrite ion, oxygen reacts with nitrogen oxide which is joined by a double bond to form nitrite ion.

Now, nitrite ion cannot have an expanded octet and thus both bonds will be the same with each bond being stronger and shorter than a single bond but they will be longer and weaker than a double bond.

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