Look at the data in the table below. Which measurement has five significant figures?

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?

Apiece of copper has a temperature of 75.6 0c. when the metal is placed in 100.0 grams of water at 19.1 0c, the temperature rises by 5.5 0c. what is the mass of the metal?

The valence of aluminum is +3, and the valence of the chlorine is -1. the formula fir the aluminum chloride is correctly written as