Can someone help me
Determine the mass of 5.05 moles of magnesium (Mg)

Explanation:

To convert from moles to mass, we need to use the molar mass of the element. This can be found on the Periodic Table. It tells us the grams of magnesium in 1 mole of magnesium.

Use the molar mass as a fraction or ratio.

Multiply by the given number of moles (5.05)

The moles of magnesium will cancel each other out.

The denominator of 1 can be ignored to create a simple multiplication problem.

The original measurement (5.05 moles) has 3 significant figures. Therefore we must round our answer to the 3 sig figs. For the number we calculated, that is the ones place.

The 7 in the tenth place tells us to round the 2 to a 3.

There are about 123 grams of magnesium in 5.05 moles.

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.