Potassium (k) combines with magnesium bromide (mgbr2) to form potassium bromide (kbr) and magnesium (mg) during a chemical reaction.
which of the following shows the balanced chemical equation for this reaction?

a) k + mgbr2 = kbr + mg
b) 2 k + mgbr2 → 2 kbr + mg
c) 2 k + mgbr2 = kbr + 2 mg
d) 2 k +2 mgbr2 = 2 kbr + 2 mg

option B - 2 K + MgBr2 = 2 KBr + Mg

Explanation:

2K + MgBr2 --> 2 KBr + Mg

On Left side: 2moles of Potassium (K) reacts with 1 mole of MgBr2

On Right side: 2 moles of KBr and 1 mole of Mg.

You will observe that the coefficient of each element on left side and Right side is balanced in option B, unlike other options.

So, option B is the answer.

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.