a) Calculate the specific latent heat of fusion of nitrogen.
b) Calculate the specific heat capacity for liquid nitrogen
In 160 seconds it heated 10 degrees with a shc of 1.6 whic will let you work out the mass.
Once you gave the mass, you can multiply up to find the latent heat for nitrogen.
The gradient of the slopes allows you to work out how much change in temperature you are getting per joule of energy per kg for the shc of liquid nitrogen.