Input interpretation
hydrogen + magnesium ⟶ magnesium hydride
Balanced equation
Balance the chemical equation algebraically: + ⟶ Add stoichiometric coefficients, c_i, to the reactants and products: c_1 + c_2 ⟶ c_3 Set the number of atoms in the reactants equal to the number of atoms in the products for H and Mg: H: | 2 c_1 = 2 c_3 Mg: | c_2 = c_3 Since the coefficients are relative quantities and underdetermined, choose a coefficient to set arbitrarily. To keep the coefficients small, the arbitrary value is ordinarily one. For instance, set c_1 = 1 and solve the system of equations for the remaining coefficients: c_1 = 1 c_2 = 1 c_3 = 1 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | + ⟶
Structures
+ ⟶
Names
hydrogen + magnesium ⟶ magnesium hydride
Reaction thermodynamics
Enthalpy
| hydrogen | magnesium | magnesium hydride molecular enthalpy | 0 kJ/mol | 0 kJ/mol | -75.3 kJ/mol total enthalpy | 0 kJ/mol | 0 kJ/mol | -75.3 kJ/mol | H_initial = 0 kJ/mol | | H_final = -75.3 kJ/mol ΔH_rxn^0 | -75.3 kJ/mol - 0 kJ/mol = -75.3 kJ/mol (exothermic) | |
Chemical names and formulas
| hydrogen | magnesium | magnesium hydride Hill formula | H_2 | Mg | H_2Mg name | hydrogen | magnesium | magnesium hydride IUPAC name | molecular hydrogen | magnesium | magnesium hydride
Substance properties
| hydrogen | magnesium | magnesium hydride molar mass | 2.016 g/mol | 24.305 g/mol | 26.321 g/mol phase | gas (at STP) | solid (at STP) | solid (at STP) melting point | -259.2 °C | 648 °C | 327 °C boiling point | -252.8 °C | 1090 °C | density | 8.99×10^-5 g/cm^3 (at 0 °C) | 1.738 g/cm^3 | 1.45 g/cm^3 solubility in water | | reacts | dynamic viscosity | 8.9×10^-6 Pa s (at 25 °C) | | odor | odorless | |
Units
