Phosphoric acid, which is a component of many soft drinks, has a molar mass of 98.00 grams per mole. a sample of phosphoric acid contains 3.1 percent hydrogen, 31.6 percent phosphorus, and 65.3 percent oxygen by mass. what is the molecular formula of phosphoric acid

Explanation:

We start this question by assuming we have 100 g of phosphoric acid. Based on the percentages, this means 3.1 g of it is hydrogen, 31.6 g of it is phosphorus and 65.3 of it is oxygen. Now we can calculate the empirical formula

H : 3.1/1.008 = 3.075 ≈ 3

P : 31.6/30.97 = 1.020 ≈ 1

O : 65.3/15.99 = 4.08 ≈ 4

This would mean that its formula is H3PO4 which has a relative molecular mass of 3 (1.008) + 1(30.97) + 4(15.99) =  97.954. Since the empirical molecular mass is equal to the molar mass of this substance in grams, then we have found the molecular mass

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.