What is the mass of nacl required to make 140 grams of a 12% solution of nacl in water?

12g
14g
17g
18g

The correct answer is 17 grams.

Explanation:

To calculate the amount of NaCl required, we use the formula:

We are given:

Mass percent = 12 %

Mass of the solution = 140 grams

Putting values in above equation, we get:

Hence, the correct answer is 17 grams.

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.