What is the molar mass of a gas with a density of 4.03 g/L at –73EC and 1,140 torr?

44.1 g/mol

Explanation:

Step 1: Convert the temperature to the Kelvin scale.

We will use the following expression.

K = °C + 273.15

K = -73°C + 273.15

K = 200 K

Step 2: Convert the pressure to atm

We will use the relationship 1 atm = 760 torr.

Step 3: Calculate the molar mass of the gas

We will use the following equation derived from the ideal gas equation.

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

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.