Equations can be balanced by using the half-reaction method. which step should be completed immediately after finding the oxidation states of atoms
a inserting the coefficients
b balancing the half reactions
c identifying the half reactions
d inspecting the number of atoms

C identifying the half reactions

Explanation:

Once we have calculated the oxidation numbers of different elements the next step is to figure out the oxidation and reduction half reaction. If the oxidation number of the element increases it is said t have been oxidized, and when the oxidation number of the element decreases it is said to have been reduced.

answer

i think the answer is a) as air pressure in an area increases, the density of the gas particles in that area decreases.

hope it

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