What is the equivalent weight in g per eq of H2C3H2O4?

Refer to the Periodic Table for Atomic Masses.

H2C3H2O4

2 x H = 2 x 1 = 2

3 x C = 3 x 12 = 36

2 x H = 2 x 1 = 2

4 x O = 4 x 16 = 64

2 + 36 + 2 + 64 = 104 is the Relative Molecyualr mass / Molar mass.

NB

I think this substance could be 'Propandioic Acid' ' HOOC- CH2 - COOH'.