Final answer:
The average mass obtained in the experiment, rounded to three decimal places as per the significant figures rule, is 1.448 g.
Step-by-step explanation:
To find the average mass obtained in the experiment, we add up all the masses of the products and divide by the number of experiments. Therefore, the average mass is (1.445 g + 1.448 g + 1.450 g) / 3, which equals 4.343 g / 3 or approximately 1.4477 g.
However, when reporting the final answer, it should be rounded to match the least number of decimal places of the measured values, which in this case is three decimal places. Thus, the correctly rounded average mass is 1.448 g.