Question

count the significant digits in each of these measurements:

• 2.0 × 10^{-2} kj/mol

0.007900 j
3.3 × 10^{-1} ml

1. kg

number of significant digits

Explanation:

Step1: Count significant digits for \(-2.0\times10^{-2}\text{kJ/mol}\)

Non - zero digits (\(2\)) and the zero between non - zero digits (in \(2.0\)) are significant. So there are \(2\) significant digits.

Step2: Count significant digits for \(0.007900\text{J}\)

Leading zeros (\(0.00\)) are not significant. Trailing zeros (\(900\) after non - zero \(7\)) are significant. So there are \(4\) significant digits.

Step3: Count significant digits for \(3.3\times10^{-1}\text{mL}\)

Non - zero digits (\(3\) and \(3\)) are significant. So there are \(2\) significant digits.

Step4: Count significant digits for \(59400.\text{kg}\)

The decimal makes the trailing zeros (\(00\) after \(594\)) significant. So there are \(5\) significant digits.

Answer:

\(2\), \(4\), \(2\), \(5\)