Stoichiometry: Calculating Moles from Mass and Heat

Accuracy = How close it is to being right Precision = How the numbers of similar data compare Electronegativity = The ability to pull electrons from other atoms Electron Shielding = An imaginary shield made to protect the electrons from jumping orbitals

Avogadro's Constant = Used to find atoms by 'moles x Avogadro's number' Effective Nuclear Charge = The charge pulling the electrons and the nucleus together Precision = Important in determining errors in a lab Accuracy = Always important to think of being correct

Electron Shielding = Increases the amount of energy needed to remove electrons from the element Electronegativity = The ability to attract electrons from other atoms Precision = How similar data points compare to each other Accuracy = How close a value is to the true value

In pure NaCl, there is 1 mol of each ion if 1 mol of NaCl dissociates = True A fixed ratio of atoms in each element creates a fixed mass ratio in a compound = True Electronegativity is the ability to release electrons from other atoms = False Avogadro's Constant is used to find the mass of an atom = False

Accuracy = Always important to think of being correct Precision = Important in determining errors in a lab Electronegativity = Important in understanding atomic interactions Electron Shielding = Important in understanding periodic trends

Avogadro's Constant = 6.022 x 10^-34 Molar Mass = Atomic mass x subscript Moles = Mass of substance / Molar Mass Atomic Mass = Weighted average of isotopic masses

moles = mass / molar mass = Find moles given an identified amount of mass n = PV / RT = Find moles using the ideal gas law moles = Q / (mcΔT) = Find moles given heat and temperature change molar mass = mass / moles = Find molar mass from mass and moles

Using mole ratios from stoichiometry = Find moles received/used up in a reaction Using molar mass from the periodic table = Find molar mass of an element or compound Rearranging the ideal gas law = Find moles of a gas given pressure, volume, and temperature Dividing mass by molar mass = Find moles given an identified amount of mass

n = PV / RT = moles, pressure, volume, gas constant, temperature moles = mass / molar mass = mass, moles, molar mass moles = Q / (mcΔT) = moles, heat, mass, specific heat, temperature change molar mass = mass / moles = mass, moles, molar mass

Given the heat and temperature change = moles = Q / (mcΔT) Given the pressure, volume, and temperature of a gas = n = PV / RT Given the mass of a substance and its molar mass = moles = mass / molar mass Given the coefficients of compounds in a reaction = Using mole ratios from stoichiometry

Molar mass = The mass of one mole of a substance Mole ratios = The ratio of moles of different compounds in a reaction Stoichiometry = The study of the quantities of reactants and products in a reaction Heat and temperature change = Variables used to calculate moles of a substance

The periodic table = Molar mass of an element Stoichiometric coefficients = Mole ratios of compounds in a reaction The ideal gas law equation = Relationship between pressure, volume, temperature, and moles of a gas A substance's properties = Specific heat of a substance