There is a little island off the shore of Brazil where the weather is extremely consistent. From 1911 to 1990, the lowest temperature on the island was 18°C (64°F) and the highest temperature was 32°C (90°F). It is known that the liquid in a standard can of soft drink absorbs 20.8 kJ of energy when its temperature increases from 18.0°C to 32.0°C. If the soft drink has a mass of 0.355 kg, what is its specific heat capacity?