Chemical Calculations
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What is an isotope
Atoms of the same element with different numbers of neutrons but the same number of protons
How to calculate relative atomic mass
(mass X percentage)+(mass X percentage) / 100
How to calculate RFM
Relative formula mass of any compound is the sum of the relative atomic masses
How many atoms are in one mol of any substance
(6.02 x 10^23)
What the equation triangle for mass moles and RFM
M g Moles RFM (mr) or mr mol
How can you calculate unknown mass given data and a balanced equation
• Calculate the number of moles in the substance with mass given • Calculate the ratio • Use m = n x Mr to find mass
What is the limiting re agent
The reactant that is all used up, setting a limit on how much product can be formed, the reactant that is left over is described as being in excess
How do you calculate the limiting re agent
• Calculate the number of moles in each substance • Divide by the ratio • The smallest number is the limiting reagent
How can you construct balanced equations from mass data
• Calculate the number of moles for each substance • Divide all of the moles by the smallest one • the numbers left can be substituted into the equation to balance it