692.04 u 1.22m 3.468 g work each of the following problems, observing significant figure rules: three determinations were made of the percentage of oxygen in mer results were 7.40%, 7.43%, and 7.35%. what was the average percentay the percentage of oxygen in mercuric oxide. the a rectangular solid measures 13.4 cm x 11.0 cm x 2.2 cm. calculate solid. 4 cm x 11.0 cm x 2.2 cm. calculate the volume of the ercury is 13.6 g/ml, what is the mass in grams of 3426 ml of the liquid? a copper cylinder, 12.0 cm in radius, is 44.0 cm long. if the density of copper is 8.90 g/cm°, calculate the mass in grams of the cylinder. (assume pi= 3.14)