Chemistry Test Molar Mass exam with 100% Correct answers already graded A+

Define: Avogadro's number 6.023x 10^23 One mole of a pure substance Define: Empirical Formula elements combined in a compound with subscripts showing the smallest whole-number mole ratio Define: Molecular formula a formula showing the types and numbers of atoms combined in a single molecule of a molecular compound Define: Formula mass the sum of the average atomic masses of all the atoms represented in the formula of any molecule, formula unit, or ion Define: Molar Mass The mass of one mole of a pure substance Convert atoms, particles, molecules to moles given scientific notation x 1 mole/ 6.023x10^23 DIVIDE given scientific notation BY 1 MOLE (6.023x10^23) Find the molar mass of compounds 1.Use the periodic table to find the amu. 2.Multiply the amu of the element by the subscript (if any) 3.Add the products Convert moles to particles given #of moles x 6.023 x 10^23/1 particle 1. MULTIPLY the given number of moles by 1 mole (6.023x 10 ^23) Convert grams to moles Given number of grams x 1 mole / molar mass of element given 1. divide the given number of grams by the molar mass of the element given Convert moles to grams Given number of moles x molar mass of element/1 mole 1. Multiply the given amount of moles by the molar mass of the compound Find how many particles are in a given number of grams TWO CONVERSIONS convert to moles then convert to particles (or whatever unit) 1. Convert given number of grams to moles by dividing by molar mass 2. Convert the moles to particles by multiplying by 6.023x 10^23 Find how many grams are in a given number of atoms TWO CONVERSIONS Convert atoms to moles first, then convert to grams 1. Convert atoms to moles by dividing by 6.023 x 10^23 2. Convert moles to grams by multiplying by molar mass Calculate percent composition 1.Find the molar mass of the compound 2.Divide the molar mass of each element by the total molar mass of the compound *Should equal 100% Find the empirical formula of a compound Given: should be percentages of elements 1.Convert the percentage to moles by dividing by amu 2. Divide the whole compound by the least number of moles Find the molecular formula Given: Should be percentages AND a molar mass 1. Find the empirical formula of the elements 2. Find the molar mass of the empirical formula