Chapter 4 -Stoichiometry and general concepts

Avogadro's number is based off the number of atoms in 12 grams of which element?

Pure isotope carbon-12

How many molecules are there in one mole?

6.022 x 10^23

How many hydrogen molecules are there in one mole of H2O?

12.04 x 10^23 hydrogen molecules

What is the formula for moles?

Moles = mass of sample (g)/molar mass (g/mol)

CO2 has a molar mass of 44g/mol. How many moles of CO2 do you have if you have 88g of CO2?

2 mols

What is an intrinsic property?

A property that is dependent on the identity of the substance, not the quantity of it.

What is an extrinsic property?

A property that is dependent on the quantity of the substance

Is mole considered an intrinsic or extrinsic property?

Extrinsic, as it depends on the quantity of substance being measured

What is the formula for density?

Density = mass (g)/volume (mL)

What does empirical formula refer to?

The formula that gives the lowest whole-number ratio of atoms in the compound

What is the empirical formula for glucose, C6H12O6?

CH2O

What is the formula for percent composition?

Mass of element in substance (g)/molar mass of compound (g/mol)

What is the formula for percent yield?

Percent yield = actual yield/theoretical yield x 100

What is the percent yield if an experiment has a theoretical yield of 50 grams and an actual yield of 40 g?

40/50, as such 80%