What is the heat evolved of oxalic acid if the temperature change initial is 28 degrees celcius and the final is 29 degrees celcius and the change in temperature is 1 degree celcius,what is the heat capacity of axolic acid

You have too many unknowns. No heat is given, no heat capacity is given, no mass is given.

To calculate the heat capacity of oxalic acid, we need to use the equation:

Q = m * C * ΔT

Where:
Q is the heat evolved or absorbed (in joules)
m is the mass of the substance (in grams)
C is the specific heat capacity of the substance (in J/g°C)
ΔT is the change in temperature (in °C)

In this case, you haven't provided the mass of the oxalic acid, which we would need to calculate the heat capacity accurately. Therefore, it is not possible to determine the heat capacity without the mass information.