What is the temperature rise when 2100 J of energy is supplied to 100 g of water? (Specific heat capacity of water \( = 4.2{\text{ J}}\,{{\text{g}}^{ - 1}}{{\text{K}}^{ - 1}}\).)

A.     5 °C

B.     278 K

C.     0.2 °C

D.     20 °C

A

This question was designed to test an understanding of difference in temperature. Although 68% gave the correct answer, nearly 20% added 273 (answer B).