Calculate the percent composition of aluminum oxide (al2o3). *show how you got the answer ! *

Answers

Take the atomic mass of aluminum and the elements in sulfate. Then divide by the total mass of aluminum sulfate. You will end up with a decimal so you then multiply by 100 to get your percentage.

Example

Al-26.98/(total mass)= .something • 100= %

Assume 1mol of Al2O3:

mm(Al) = 26.98g/mol

x2(moles needed in 1mol of Al2O3)

= 53.96g

~54g

mm(O) = 16.00g/mol

x3(moles needed in 1mol of Al2O3)

=48g

mm(Al2O3) = m(Al) + m(O)

= 102g/mol

x1mol

=102g (in 1 mol)

What percent of the total does X or Y take up?

Just take the portion that it gets and divide by the total:

Al: 54/102 = 53%

O: 48/102 = 47% or 100%-53%=47%

Notice that, with binary compounds, you only need to calculate one of the two elements: the remaining amount HAS to be taken up by the other element, or else there would be something else involved.

Assume 1mol of Al2O3:

mm(Al) = 26.98g/mol

x2(moles needed in 1mol of Al2O3)

= 53.96g

~54g

mm(O) = 16.00g/mol

x3(moles needed in 1mol of Al2O3)

=48g

mm(Al2O3) = m(Al) + m(O)

= 102g/mol

x1mol

=102g (in 1 mol)

What percent of the total does X or Y take up?

Just take the portion that it gets and divide by the total:

Al: 54/102 = 53%

O: 48/102 = 47% or 100%-53%=47%

Notice that, with binary compounds, you only need to calculate one of the two elements: the remaining amount HAS to be taken up by the other element, or else there would be something else involved.



Do you know the answer?

Other questions on the subject: Chemistry

1. The density of the fluid - if the fluid has more density it exerts more pressure.2. The temperature value of the fluid - a fluid that has a higher temperature value is likely to...Read More
1 more answers
Chemistry, 22.06.2019, gungamer720
Competitive inhibition Explanation:Enzymes increase the rate of chemical reactions by working on specific substrates.Enzyme activity is affected by various factors which include, p...Read More
1 more answers
Chemistry, 22.06.2019, simihehe
A. contains 18 electronsExplanation:Atomic number is defined as the number of protons or number of electrons that are present in an atom. It is characteristic of an element.Atomic...Read More
2 more answers