50 grams.

According to querying the mass conversion unit, we know that 1 tael = 50 grams. By calculation: 1*50 = 50, so one tael of gold is equal to 50 grams.

A gram (g) is a unit of mass, one thousandth of a kilogram (kg). One gram is the mass of 0.501×10^23 C-12 atoms. The mass units of meters, kilograms and seconds in the International System of Units are also one of the seven basic units of the International System of Units.