Divide the total mass by the number of pieces.<br><br>
&bull; Mass of each piece = \( \frac{8}{9} \div 2 \)<br>
&bull; \( \frac{8}{9} \div 2 = \frac{8}{9} \times \frac{1}{2} = \frac{8}{18} \)<br>
&bull; Simplify: divide numerator and denominator by 2.<br>
&bull; \( \frac{8}{18} = \frac{8 \div 2}{18 \div 2} = \frac{4}{9} \)<br><br>
Final Answer: \( \frac{4}{9} \) kg