A buffer with a pH of 4.00 contains 0.19 M of sodium benzoate and 0.30 M of benzoic acid. What is the concentration of [H3O ] in the solution after the addition of 0.052 mol HCl to a final volume of 1.3 L

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)

i do not get it   at all

i think its 100

i hope this !

you need to have a picture of the atom that way we can answer it