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?

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

What is the formula for 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?

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%