![]() ![]() ![]() Therefore, what is the relative formula mass of AlOH3? The answer is 78. Note that since the relative atomic mass for an element is a unitless measure, meaning it does not contain units after the number, the relative formula mass we obtain by summing all of the relative atomic masses together is also unitless. Now we will add together all of the relative atomic masses for all of the elements in the chemical formula: 27 plus 48 plus three, which gives us a relative formula mass of 78. Finally, hydrogen has a relative atomic mass of one, which we will multiply by three for a product of three. Oxygen has a relative atomic mass of 16, which we will multiply by three, for a product of 48. The number of moles in a system can be determined using the atomic mass of an element, which can be found on the periodic table. Aluminum has a relative atomic mass of 27, which we will multiply by one for a product of 27. Now that we have identified the number of atoms for each element, let us multiply each by the relative atomic mass that was provided in the question for each element. Therefore, there are three atoms of oxygen and three atoms of hydrogen. Molar Mass of Aluminum - What Is This Chemical Element Name: Aluminum (Al). This means that for every one aluminum ion, there are three hydroxide ions. When looking at the hydroxide ion, OH, we notice there is a subscript three on the outside of the parentheses. We can see there is no subscript for Al, only an implied number one, indicating there is only one atom of aluminum. Since we have been provided the chemical formula AlOH3, let’s identify how many atoms of each element are in the formula. In other words, it is the sum of the number of each type of element multiplied by the elements relative atomic mass, denoted as A r. To begin to solve this problem, the definition of relative formula mass, denoted as M r, is the sum of the relative atomic masses of constituent elements of the chemical formula. What is the relative formula mass of AlOH3, where the relative atomic mass of aluminum is 27, hydrogen is one, and oxygen is 16? ![]()
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