The air in a crewed spacecraft or submarine needs to be purified of exhaled carbon dioxide. write equations for the reactions between carbon dioxide and the following compounds. remember to include the states of all reactants and products in your equations.
(a) lithium oxide (li2o)(b) sodium peroxide (na2o2)

See below.

Explanation:

(a)  Li2O(s) + CO2(g)  >  Li2CO3(s).

(b)  2Na2O2(s) + 2CO2(g) >  2Na2CO3(s)  + O2(g).

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

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.