Moles

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The basics
Aaishah Din
Flashcards by Aaishah Din, updated more than 1 year ago
Aaishah Din
Created by Aaishah Din over 6 years ago
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Question Answer
Define Relative atomic mass The mean relative mass of all the isotopes of an element, compared with the standard carbon atom.
define relative formula mass all of the masses of each element in a compound, added up
Define mole a mole of a substance is simply the RFM or RAM of it expressed in grams. A mole of a substance always has the same number of ions, molecules, or atoms in a mole: 6.02x10^23.
define Avagadro's constant 6.02x10^23
Give the formula connecting moles, mass, and and Ar or Mr Moles = Mass/Mr
What can you tell from a balanced symbol equation You can tell how many moles of each substance, and what mass of a substance, you need to carry out the equation
Give the steps to balancing equations using moles 1) find the masses of each substance 2) Find out how many moles of each substance you have 3) find the whole number ratio of numbers of moles
Define limiting reactant The reactant that gets used up first in a reaction
Give the formula for percentage yield. yield: actual mass produced/maximum theoretical mass of product possible
Give factors why yield may not be 100% 1) the reaction is reversible 2) some reactants produce unexpected products 3) some product left behind in the apparatus 4) reactants may not be completely pure 5) may be difficult to separate product we want
What is atom economy the measure of the extent to which the atoms in the starting materials ends up in the desired product
why is atom economy important? It saves money, and wastes less raw materials; it also reduces pollution and the number of limited resources used.
what is the equation for atom economy relative formula mass of the desired product ÷ sum of RFM of reactants of the equation
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