Question

give the correct number of significant figures for each of the following measured values (e.g., 1, 2, 3, ... or \amb\ for ambiguous).
240 kj
1.870 atm
0.0020 m³
0.158 mol

Explanation:

Step1: Analyze 240 kJ

Non - zero digits are significant. Trailing zero without a decimal point is ambiguous. So it's "amb".

Step2: Analyze 1.870 atm

Non - zero digits are significant, and trailing zero after a decimal point is significant. So there are 4 significant figures.

Step3: Analyze 0.0020 m³

Leading zeros are not significant. Trailing zero after a non - zero digit and after a decimal point is significant. So there are 2 significant figures.

Step4: Analyze 0.158 mol

Non - zero digits are significant, and leading zeros are not significant. So there are 3 significant figures.

Answer:

amb
4
2
3