Count the significant digits
-6.0 * 10 to power of -2 kJ/mol
0.006700J
31900kg
6.4* 10 to power of -3 mL
-6.0 * 10 to the power of -2 kJ/mol has 2 significant digits.
0.006700J has 4 significant digits.
31900kg has 3 significant digits.
6.4 * 10 to the power of -3 mL has 2 significant digits.
To count the significant digits in each number, follow these steps:
-6.0 * 10^-2 kJ/mol:
Significant digits: 2 (6 and 0)
0.006700 J:
Significant digits: 4 (6, 7, 0, and 0)
31900 kg:
Significant digits: 3 (3, 1, and 9)
6.4 * 10^-3 mL:
Significant digits: 2 (6 and 4)