What is the value o!?

What is the value for DeltaH for the given process, NaOH(aq) + HCl (aq) to NaCl(aq) + H_2O(l) ?

XR is a tangent to the circle. O is the centre of the circle. If /_XRP=120^(@) , then what is the value (in degrees) of /_QOR ?

O is the centre of the circle. A tangent is drawn which touches the cirlce at C. If /_AOC=80^(@) , then what is the value (in degrees) of /_BCX ?