4NaCl + 2SO2 + H2O + O2 → Na2SO4 + 4HCl Which numbers balance this equation?

- 1,2,4
- 1,2,2
- 2,1,2
- 2,1,4

in theory, limestone is composed principally of the compound calcium carbonate - caco3, but in reality this compound is deposited in conditions involving a number of other compounds as impurities so it ends up being a mixture of many compounds.

hope this : -)

tony (lordcaos066)

a is the correct answer