posted by Sheena .
Two iron bolts, one at 100. °C with a mass of 52.8g, the other at 56.0°C with a mass of 66.8g, are placed in an insulated container. Assuming the heat capacity of the container is negligible, what is the final Celsius temperature inside the container (c of iron = 0.450 J/g·K)?
You need to know the temperature of the air inside the container. I assume you are heating air and not water or some other liquid.