# Recent content by dacoolguy

1. ### Number of atoms reacting with a gas

Homework Statement 4Al + 3O2 = 2Al2O3 What number of O-atoms will react if 45dm3 of the gas reacts with an excess of Al? The answer is apparently: 4 atoms Homework Equations The Attempt at a Solution Using the formula n=V/Vn (or the law stating that any gas occupies 22.4dm3 at...
2. ### Empirical Formula of a Compound with only percentages given

I'm really sorry- worked it out from another thread:) Percent to mass, Mass to mole, Divide by small, Multiply 'til whole. Assume 100g of compound. Change % to g. Divide these masses by their molar masses to get moles. Divide each mole amount by the smallest mole quantity of the group. You'll...
3. ### Empirical Formula of a Compound with only percentages given

Homework Statement Determine the Empirical Formula of a compound which, when analyzed, is shown to consist of 62.07% carbon, 27.59% oxygen and 10.34% hydrogen. The answer is supposedly C3OH6 Homework Equations The Attempt at a Solution First,I started by writing the ratio: C : O : H Then...