Hello, in this situation, the chemical reaction occurring is as follows: Next, we will ascertain the limiting reactant by calculating the moles of magnesium oxide produced from 3.86 g of magnesium and 155 mL of oxygen using the given mole ratios of 2:1:2 and applying the ideal gas equation, demonstrating that oxygen is the limiting reactant because it generates the least magnesium oxide. Subsequently, we determine the mass of magnesium consumed solely by the oxygen.
Answer:
Protons: 19
Neutrons: 25
Electrons: 19
Explanation:
Protons:
The atomic number determines the number of protons in an atom. Consequently, with Potassium's atomic number being 19, it contains 19 protons.
Neutrons:
The formula to find neutrons is:
# of Neutrons = Atomic Mass - # of Protons
Given:
Atomic Mass = 43
# of Protons = 19
Thus,
# of Neutrons = 43 - 19
# of Neutrons = 24
Electrons:
In a neutral atom, the quantity of electrons matches that of protons. Therefore, a neutral Potassium atom with 19 protons must equally have 19 electrons.
The appropriate answer is option E. Gibbs free energy can be expressed using the equation: ΔG = ΔH - TΔS, where ΔH denotes the change in enthalpy of the reaction, T is the reaction temperature, and ΔS signifies entropy change. For our calculations, we have ΔH = -720.5 kJ/mol which converts to -720500 J/mol (given that 1 kJ = 1000 J), ΔS = -263.7 J/K, and T = 141.0°C, which equals 414.15 K. Consequently, the Gibbs free energy for the specified reaction at 141.0°C is calculated as -611.3 kJ/mol.
The composition consists of 62 % one isomer and 38 % its enantiomer.
Assuming that the mixture comprises 62 % of the (R)-isomer.
Then the percentage of the (S) is calculated as 100 % - 62 % = 38 %.
Enantiomeric excess = % (R) - % (S) = 62 % - 38 % = 24 %.
