Quantitative Chemistry Flashcards
What does the conservation of mass say?
No atoms are lost or made during a chemical reaction, so the mass of the products equals the mass of the reactants
Simply, how do we calculate the percentage by mass
Divide the mass of the element in 1 mole of the compound by the compound’s molar mass, and multiply the result by 100
If a system isn’t enclosed, what may escape during the reaction?
Gas
How is a mean calculated?
Sum of all values divided by the amount of values present
Unit for moles
Mol
The mass of one mole of a substance in grams is numerically equal to the substance’s …
Relative formula mass
A higher volume means what for concentration?
Decrease in concentration
What is the avogadro cosntant as an explanation?
The number of atoms, molecules or ions in a mole of a given substance
What is a limiting reactant?
The reactant that gets used up first and limits the amount of products
What is the avogadro constant (standard form)?
6.02 x 10^23
To calculate the number of moles of any substance in the sample …
Divide the given weight of the substance by its molar mass
The higher the mass of the solute means what for concentration?
Increase in concentration
How to calculate percentage yield
Mass of product actually made
—————————————————– x 100
Maximum potential mass of product
What unit is used to measure concentration?
Mol/dm^3
