There are two open cans of soda on the table one can was just take it on the refrigerator and the other was taken from the cup board upon opening the cans which one loses carbon dioxide more quickly and why

The one from the cupboard because it is warmer (has more thermal energy) than the one from the refrigerator. When a liquid becomes warmer, the solubility of a gas becomes lower. Therefore, there is already more CO2 in its gaseous state when the soda is warm.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

c. orbital shape i hope this is correct