Count the significant digits of each
0.00400J
3.4*10 to power of -3 mL
-1.0* 10 to power of-2 kJmol
0.00400J has three significant digits.
3.4*10^-3 mL has two significant digits.
-1.0*10^-2 kJmol has two significant digits.
To count the significant digits in each number, you need to identify the non-zero digits as well as any zeros between non-zero digits.
1. 0.00400J: This number has two significant digits because there are two non-zero digits (4 and 4) between the first and last zero.
2. 3.4 * 10^-3 mL: The number written in scientific notation is 3.4 * 10^-3 mL. The significant digits in this case are the digits in 3.4, which are two.
3. -1.0 * 10^-2 kJmol: The number written in scientific notation is -1.0 * 10^-2 kJmol. The significant digits in this case are the digits in 1.0, which are two.