Chemical calculator Understanding the mole Mole, atom and molecules Calculation of the molar mass Calculation of the percentage of elements in a simple substance Calculation of the percentage of the elements in a substance Calculation of molecular formula from the percentage of the elements and the molar mass, simple cases; Calculation of molecular formula from the percentage of the elements and the molar mass Calculation of the number of moles from the formula and molar mass of a substance, simple cases Calculation of the number of moles from the formula and mass of a substance Calculation of mass from the formula and the number of moles of a substance, simple cases; Calculation of mass from the formula and the number of moles of a substance Relationship between mass, number of moles and molar mass of a substance Calculation of molar mass and percentage of elements of a substance Molar mass from the formula Percentage from the formula Dilutions and concentrations Quantity, mass, volume, percentage, concentrations (exercises)