How many moles of Al2O3 exist in 250.0 g of sample? Please help tried still can't understand how to get it. Need before tomorrow. Thanks so much.

The mass of 1 mole of anything is the same as the molar mass in grams; therefore, mols = grams/molar mass = ?

Dubs

To calculate the number of moles of Al2O3 in a given sample, you need to use the molar mass of Al2O3 and the given mass of the sample.

Step 1: Determine the molar mass of Al2O3.

The molar mass of Al2O3 can be calculated by adding the atomic masses of aluminum (Al) and oxygen (O).
Aluminum (Al) has an atomic mass of 26.98 g/mol, and oxygen (O) has an atomic mass of 16.00 g/mol.

Calculating the molar mass of Al2O3:
2(Al) + 3(O) = (2)(26.98 g/mol) + (3)(16.00 g/mol) = 101.96 g/mol

So, the molar mass of Al2O3 is 101.96 g/mol.

Step 2: Use the given mass and molar mass to calculate the number of moles.

Given mass = 250.0 g
Molar mass of Al2O3 = 101.96 g/mol

To calculate the number of moles, you can use the formula:
Number of moles = Given mass / Molar mass

Number of moles = 250.0 g / 101.96 g/mol ≈ 2.45 mol

Therefore, there are approximately 2.45 moles of Al2O3 in a 250.0 g sample.

To determine the number of moles of Al2O3 in a given sample, you need to use the molar mass of Al2O3 and the mass of the sample. Here's how you can do it:

1. Look up the molar mass of Al2O3:
- Aluminum (Al) has a molar mass of 26.98 g/mol.
- Oxygen (O) has a molar mass of 16.00 g/mol.
- Since there are two aluminum atoms and three oxygen atoms in Al2O3, the molar mass of Al2O3 is (2 * 26.98 g/mol) + (3 * 16.00 g/mol) = 101.96 g/mol.

2. Convert the mass of the sample (250.0 g) to moles:
- Divide the mass of the sample by the molar mass of Al2O3.
- Moles of Al2O3 = mass of the sample / molar mass of Al2O3
- Moles of Al2O3 = 250.0 g / 101.96 g/mol

3. Calculate the moles:
- Divide the mass of the sample by the molar mass of Al2O3:
- Moles of Al2O3 = 2.449 moles (rounded to three decimal places)

Therefore, there are approximately 2.449 moles of Al2O3 in a 250.0 g sample.