Gina’s teacher calculates the energy stored in 0.9g of paraffin is enough to raise the temperature of the water much more that 10 degree celsius. Explain why Gina did not get a bigger temperature rise

Gina’s teacher calculates the energy stored in 0.9g of paraffin is enough to raise the temperature of the water much more that 10 degree celsius. Explain why Gina did not get a bigger temperature rise.