12g of magnesium ribbon was heated in a crucible. At the end of the reaction 20g of magnesium oxide had been produced. What mass of oxygen had reacted with the magnesium?

16 g of reacted with the magnesium

Explanation:

from the equation of reaction: 2Mg + →

48g of Mg requires 32g of O2 to yield 80g of MgO

That is :

    48 : 32 : 80

Hence 12 : x: 32

xg of O2  =

= 16 g of

Therefore:

16 g of reacted with the magnesium

the answer is 0.8m.

by: nicholas

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.