What happens to bond angles as you add an electron domain

Can anyone (a-level) a student was analysing a carbonate compound, mco3, containing an unknown group 2 metal, m. the student carried out thermal decomposition on 0.730g of the carbonate and measured the volume of gas produced. mco3 (s) mo (s) + co2 (g) the student collected and measured 120cm3 of carbon dioxide. 1 mol of carbon dioxide occupies 24 000 cm3 under these conditions. calculate the molar mass of the group 2 carbonate and hence deduce the identity of the group 2 metal, m.

You may expect bonds between two atoms which each have n covalent lonic metallic hydrogen

If 1.8 l of water is added to 2.5l of a 7.0 molarity koh solution, what is the molarity of the new solution