An unknown compound has the following chemical formula: Mg, C12
where x stands for a whole number.
Measurements also show that a certain sample of the unknown compound contains 4.3 mol of magnesium and 8.62 mol of chlorine.
Write the complete chemical formula for the unknown compound.

Classify each statement about effective nuclear charge, zeff, as true or false.

10-14. (a) when 100.0 ml of weak acid ha were titrated with 0.093 81 m naoh, 27.63 ml were required to reach the equivalence point. find the molarity of ha. (b) what is the formal concentration of a- at the equivalence point? (c) the ph at the equivalence point was 10.99. find pk. for ha. (d) what was the ph when only 19.47 ml of naoh had been added?

Iknow the answer is a but i don't know why