Question

calculate the percentage composition of aluminum hydroxide?​

Answer 1

Answer:

Aluminium Hydroxide molecular weight

Molar mass of Al(OH)3 = 78.003558 g/mol

Convert grams Aluminium Hydroxide to moles or moles Aluminium Hydroxide to grams

Molecular weight calculation:

26.981538 + (15.9994 + 1.00794)*3

Percent composition by element

Element Symbol Atomic Mass # of Atoms Mass Percent

Aluminium Al 26.981538 1 34.590%

Hydrogen H 1.00794 3 3.877%

Oxygen O 15.9994 3 61.533%

Answer 2

The percentage composition of aluminium hydroxide is 34.59%

Explanation:

In order to calculate the mass percent of aluminium in that ionic compound, we're going to need two things:

The formula mass of the entire compound

The atomic mass of aluminium

The formula mass of aluminium hydroxide is 78.00g/mol

because:

The molar mass of Al=26.98, H=1.0079, and O=16.00

26.98 g/mol + 3 (16.00 g/mol) + 3(1.0079 g/mol) = 78.00 g/mol

We already know the atomic mass of aluminium since that's already given.

now, we have to use the following equation:

Percentage Composition = (Total Mass of Element Present) / (Molecular mass) * 100

The numerator represent the mass of the desired atom, which is Al in our case, and the denominator represents the mass of the entire compound. you just divide the two and multiply by 100 to obtained the percent composition:

Mass of Al / Molar Mass of Al(OH)3 * 100%

26.98 g / mol / 78.00g / mol * 100% = 34.59