Chapter 8: Stoichiometry

Avocados!

100

The Italian scientist who discovered a number to represent moles and atoms.

What is Avogadro?

200

This number represents Avogadro's number.

What is 6.022 x 10²³?

300

When converting to molecules from the mole box, do you multiply or divide by Avogadro's number?

What is multiply?

400

This number represents how many moles of potassium (K) atoms are in 3.04 grams of pure potassium metal.

What is 0.078 mol K?

500

This number represents how many atoms are in 50g of calcium.

What is 7.5 a 10²³ atoms?

Terms/Definitions

100

The study of quantitative relationships that can be derived from chemical formulas and equations.

What is Stoichiometry?

200

The sum of atomic masses of all atoms represented by the formula of a substance.

What is formula mass?

300

The formula that represents the smallest whole- number ratio between elements in a compound.

What is Empirical Formula?

400

The percentage by mass of each element in a compound.

What is percentage composition?

500

Two Greek words were used to derive the English word, Stoichiometry.

What is Stoikhein and metron?

Formula Mass

100

The formula mass for 1 mole of Nitrogen.

What is 14 amu/g?

200

The formula mass for a nitrogen gas molecule.

What is 28.0 amu/g?

300

The formula mass for NH₃.

What is 17 amu/g?

400

The formula mass for N₂H₄. 

What is 32 amu/g?

500

The formula mass for HNO₃.

What is 63 amu/g?

STP

100

14.0 g of CO gas occupies a particular volume at STP.

What is 11.2 L?

200

16.0 g of SO₂ gas occupies a particular volume at STP.

What is 5.6 L?

300

1.5 mol of CH₄ occupies a particular volume at STP.

What is 33.6 L?

400

1.20 x 10²³ molecules of NO₂ gas occupies a particular volume at STP.

What is 4.46 L

500

The two units of measurement that represent the temperature and pressure at STP.

What are Celsius and kiloPascal?