Pyramids were built in Ancient Egypt as tombs, or burial places, for Egyptian pharaohs, or kings. They believed that the pyramids made you immortal. The Ancient Egyptians believed in an afterlife, so it was very important to them to protect the bodies of their pharaohs.
CaCO3, or calcium carbonate, has a molar mass of 100.09 grams per mole. This means there are roughly 566 grams of CaCO3.
1 mole of CO2 is 44g. Therefore, 6.3 grams of CO2 is 0.143 moles of CO2. 1 mole of any ideal gas is 22.4 liters at standard temp & pressure. Therefore 0.143 moles of CO2 is 3.2 liters. So, you are correct -- 3.2 volumes of CO2 per volume of beer.