Chemical calculations Flashcards
1
Q
What is Ar (relative atomic mass)?
A
The average mass of an atom of an element when compared with 1/12 of the mass of a carbon-12 atom
2
Q
What is Mr (relative molecular mass)?
A
The average mass of a molecule of a substance when compared with 1/12 of the mass of a carbon-12 atom
3
Q
What is the formulas for no. of moles?
A
-number of particles/ 6 x 10^23
-mass (g) / Mr
-volume (dm^3) / 24dm^3
-concentration (mol/dm^3) x volume (dm^3)
4
Q
What is the formula for concentration?
A
-no. of moles/ vol of solution (mol/dm^3)
-mass/ vol of solution (g/ dm^3)
5
Q
How to find volume of reacting gases?
A
mole ratio = volume ratio
