Stoichiometry Flashcards
1
Q
relative atomic mass (Ar) description
A
the average mass of the isotopes of an element compared to 1/12th of the mass of an atom of 12C
2
Q
relative molecular mass (Mr) definition
A
the sum of the relative atomic masses (Ar)
3
Q
MASH
A
metal + acid –> salt + hydrogen
4
Q
MoASH2O
A
metal oxide + acid –> salt + water
5
Q
McoASH2OCO2
A
metal carbonate + acid –> salt + water + carbon dioxide
6
Q
how many atoms in 12g of carbon
A
6.02 x 10**23
7
Q
mole definition
A
6.02x10**23 atoms, also known as Avogadro’s constant (N(little A)
8
Q
12g of 12C formula and answer
A
n (moles) = m (mass) /Mr (relative molecular mass)
n=12g/12
n=1
1 mole (mol) of 12C
9
Q
Atom(molecules) formula
A
n (moles) x N(little A) (Avogadro’s constant) (6.02x10**23)
10
Q
mole formula in a gas
A
n=vol/24
11
Q
volume of a gas
A
vol=n*24
