1) The published a18O value for CO2-calcite is 1.01025@ 25C. This is the reaction where CO2 is liberated from calcite by reaction with phosphoric acid at 25C. A laboratory wants to run this reaction at 50C because it is faster and they are impatient. They analyze NBS-19 which has an assigned d18O value of 2.20% (vs PDB). They get d18O value of CO2 liberated at 50C of 7.09% (vs PDB ). What is the a18O value for CO2-calcite at 50C that they should use for future analyses