2. classify each of the following reactions as a
synthesis, decomposition, single-displacement,
double-displacement, or combustion reaction:
a. n.(g) + 3h2(g) +2nh2(g)
b. 2li(s) + 2h,0(1) -2lioh(aq) + h2(g)
c. 2nano3(s) +2nano3(s) + 0,(9)
d. 2ch() + 190,(g) 1200,(g) + 14h, o(1)

a. Synthesis reaction

b. Single - Displacement

c. Decomposition reaction

d. Combustion Reaction

Explanation:

Synthesis reaction: Reaction in which two or more substance combine to give a single compound.

Single - Displacement : Reaction in which the more reactive element displaces the less reactive element.Here Li replace OH from water.

Decomposition reaction: Reaction in which a single reactant decompose to give two or more products.

Combustion Reaction : IT is a redox reaction in which a substance is burned in the presence of oxygen to give carbon dioxide and water.

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