The pressure of a gaseous mixture of NH3 and N2 decreased from 1.50 kPa to

Question

1.00 kPa after the NH3 was absorbed from the mixture. Assuming ideal gas
behavior, find the composition of the original mixture.

Answer 1

XNH3 = pNH3/total P = 0.5/1.5 = ?
XN2 = pN2/total P = 1.0/1.5 = ?

Without additional information I don't think this can be converted to grams.