According to S.I. the system, ______ was used to measure the amount of substance.Group of answer choicesmassweight machineweightmole

Breakdown of the Problem

1. Identify what the question is asking: It seeks to identify the unit used in the S.I. (International System of Units) to measure the amount of substance.

Relevant Concepts

2. Recall the S.I. units associated with various physical quantities:
   • Mass is measured in kilograms (kg)
   • Weight is the force due to gravity on a mass, measured in newtons (N)
   • An amount of substance is measured in moles (mol)

Analysis and Detail

3. Compare the provided choices:
   • mass: This is related but is not the fundamental measure of the amount of substance.
   • weight: This is a measure of force, not of the amount of substance.
   • machine: This is not applicable as it relates to equipment, not a measure.
   • weight: Again, this is not relevant to measuring the amount of substance.
   • mole: This is the standard unit in the S.I. system for measuring the amount of substance.

Verify and Summarize

4. Upon review, the correct choice corresponds to the unit specifically designated for the amount of substance, which is "mole."

Final Answer

The correct answer is mole.