What is the standard enthalpy of formation of co(g). given: ah. [c] = -393 kj mol-1. ah.[co] = -283 kj mol-.

110 kJ/mol

Explanation:

The standard enthalpy of a reaction can be calculated with the equation "H=Hp-Hr", where Hp is the enthalpy of the products and Hr the enthalpy of the reactives, in this casi your product is the CO, so -283-(-393) = 110. So the  standard enthalpy of this reaction is 110 kJ/mol.

that tool would be a compass

it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.