While it is true that not all changes, that is not the real reason for the calculation. Its because of the change in molar mass. When THCA is converted to THC you're losing part of the molecule, THCA is heavier than THC.
THC has a molar mass of 314.469 g/mol
THCA has a molar mass of 358.478 g/mol
So you're losing about 44 g/mol when it gets decarboxylated
314.469/358.478 = 0.877233749
The calculation is simply a conversion factor to account for the loss of part of the molecule
THC has a molar mass of 314.469 g/mol
THCA has a molar mass of 358.478 g/mol
So you're losing about 44 g/mol when it gets decarboxylated
314.469/358.478 = 0.877233749
The calculation is simply a conversion factor to account for the loss of part of the molecule