Conversions, Percent Compositions, & Formulas..oh my!

Conversion Factors

100

This conversion factor is the definition of 1 mole.

What is 6.022 e 23?

200

This is where to look to find the mass of 1 mole of any element.

What is the periodic table?

300

This is the conversion factor when converting between mass and # of moles.

What is molar mass?!

400

This is how to find the molar mass of any COMPOUND.

What is the sum of (the number of atoms of an element times its molar mass)?

500

This is the conversion factor for converting between moles and volume.

What is 22.4 liters in 1 mole?

Conversion problems

100

This is the number of moles in 98.5 grams of gold.

What is 0.5 moles (or half a mole)?

200

This is the mass of 6.39 moles of table salt.

What is 373.8 grams?

300

This is the volume of 4.148 moles of fluorine gas.

What is 92.9 liters?

400

This is how many molecules are in 25g of ammonia.

What is 8.85e23 molecules of ammonia?

500

This is how many atoms are in 100g of potassium hydroxide.

What is 3.22e24 atoms?

Percent composition

100

After dividing the 2 masses (elements/total compound), you must multiply by this number always to get the percent composition.

What is 100?

200

This is the percent composition of hydrogen in water.

What is 11.1% H?

300

This is the percent composition of hydrogen in ammonium ion.

What is 22.2% H?

400

This is the percent composition of nitrogen in (NH4)2S?

What is 41.2% N?

500

What is the percent composition of oxygen in copper (II) phosphate?

What is 33.5% O?

Empirical Formula

100

This is the empirical formula for N₄O₁₀.

What is N₂O₅?

200

This is the empirical formula for a compound that has 48.0% C, 4.0% H and 48.0% O.

What is C₄H₄O₃?

300

This is the empirical formula for a compound that has 36.0% C, 4.0% H, 28.0% N and 32.0% O.

What is C₃H₄N₂O₂?

400

This is the empirical formula for a compound that has 24.0 % C, 7.0 % H, 38.0 % F and 31.0 % P.

What is C₂H₇F₂P?

500

This is the empirical formula of a compound that has 48.0 % C, 8.0 % H, 28.0 % N and 16.0 % O.

What is C₄H₈N₂O?

Molecular Formula

100

This is the difference between molecular formula and empirical formula.

What is empirical formula shows simplest ratio of atoms while molecular formula shows the number of each atom in 1 molecule? (subscripts are different)

200

This is the first step in calculating the molecular formula if empirical formula and molar mass of molecular formula is given.

What is find the molar mass of the empirical formula?

300

This is the molecular formula of a compound if its empirical formula is C₂OH₄ and it has a molar mass of 88 g/mol.

What is C₄O₂H₈?

400

This is the molecular formula for a compound that has an empirical formula of C₄H₈N₂O and a mass of 200 g/mol.

What is C₈H₁₆N₄O₂?

500

This is the molecular formula of a compound that has an empirical formula of C₅H₁₂N₂ and a molar mass of 300 g/mol.

What is C₁₅H₃₆N₆?