Quick-Start Guide. When you enter an equation into the calculator, the calculator will begin by expanding (simplifying) the problem. Next, it will attempt to solve the equation by using one or more of the following: addition, subtraction, division, factoring, and completing the square.uick-Start Guide. When you enter an equation into the calculator, the calculator will begin by expanding (simplifying) the problem. Next, it will attempt to solve the equation by using one or more of the following: addition, subtraction, division, factoring, and completing the square.
Molecular formulas describe the exact number and type of atoms in a single molecule of a compound. The constituent elements are represented by their chemical symbols, and the number of atoms of each element present in each molecule is shown as a subscript following that element's symbol.
To calculate the percent composition (percentage composition) of a compound: 1  Calculate the total mass of each element present in the molecular formula of the compound. 2  total mass of element present = number of atoms of this element x relative atomic mass of element. by mass of oxygen + % by mass of hydrogen = 100 % (% by mass of water molecule). For any element present in any molecule: And, if you add together the % by mass of every element present in the compound the result will be 100%. a Y b Z c :