In the chemical reaction process
C (s)+ O2 (g)>CO2(g)

2.1 What volume of CO2 can be produced at STP if you start with 3 moles of
oxygen gas? [2]

2.2 What mass of CO2 can be produced from 1,5 moles of oxygen gas? [2]

2.3 What mass of CO2 can be produced from 12g of carbon? [2]

An acid and a base.

Example:

HCl (acid) + NaOH (base) ---> NaCl (salt) + H2O

Salts can also be formed from the reaction between:

Acid and reactive metals:

H2SO4 (acid) + Zn (reactive metal) ---> ZnSO4 (salt) + H2

Acid and metal carbonates (also a type of base):

H2SO4 (acid) + CaCO3 (metal carbonate) ---> CaSO4 (salt) + CO2 + H2O