A water sample has a mass of 25.0 g. It contains 1.56 × 10–5 g NaCl. What is the best set up to find ppm?

ppm = mol solute/mass solution × 106

ppm = mass solute/mass solution × 106

ppm = mol solute/mass solvent

Second option is the right one

Explanation:

The ppm concentration indicates a relation between the mass of solute in mass of solution, where the units have a quotient of 1×10⁻⁶.

You can think the units as mg/kg or μg / g

We assume the solvent's mass, as the solution's mass

ppm = mass solute/mass solution × 10⁶

ppm = 1.56×10⁻⁵ g NaCl . 10⁶ /25 g

ppm = 0.62

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.