3. The mercury level in cod was measured at 0.11 ppm. How many mg of mercury are present in a 150 g serving of cod? 4. How many kilograms are in 30.4 lb? 5. How many kilojoules are required to raise the temperature of a 25.0 g sample of iron from 25.0°C to 35.0 °C? Iron has a specific heat of 0.450 J/g °C. 6. A 1.8 g sample of pizza is placed in a calorimeter with 500.g of water at an initial temperature of 22 °C After combustion of the pizza the water has a temperature of 46 "C. What is the heat content, in kJ/g, of the pizza?