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The Mole and its Application Highlights
Terms in this set (17)
defined as the number of carbon atoms in exactly 12 grams of carbon-12.
1 Mole is _______ particles
6.02*10^23 is called _______ number
The simplest whole number ration of atoms of elements in the compound
In many cases, the empirical formula is the actual formula for the _________
The formula for glucose C6H12O6. Here we see that all coefficients in glucose are divisible by?
The empirical formula of glucose is _______ bc we divided the formula by the common divisible number.
The percent compositions of an unknown compound is found to be 38.43% Mn, 16.8 % C, and 44.77% O. Determine the compounds empirical formula ?
(38.43gMn) (1 Mole Mn)
(54.9 g Mn)
=0.7 mol Mn
(16.8 g C) (1mol C)
(12.0 g C)
= 1.400 mol C
(44.77 g O) (1 mol O)
(16 g O)
= 2.798 mol O
o.7/0.7 = 1 Mn
1.4/0.7 = 2 C
2.798/ 0.7 = 4 O
Empirical Formula= MnC2O4
compounds that incorporate water molecules into their fundamental solid structure
Hydrates usually have what type of form?
Specific crystalline form
In a hydrate a defined number ______
of water molecules is associate with each formal unit of primary material.
Determine the percent water in CuSO4 5 H20 (s)
mass of water is 18
mass of CuSO4 is 159.7
To get the %H20
[(18)(5) + (159.7)]
multiply answer by 100
You get 36%
Molar mass of a compound
is the mass of a mole of the representative particles of the compound.
the composition of a compound is usually stated as the percent by mass of each element in the compound
Percent composition formula
(molar mass of X)(#'s X's)
(molar mass of compound)
this multiplied by 100
tells the exact number of atoms of each element in a molecule or formula unit of a compound.
Molecular formula for a compound is either the same as the empirical formula or a whole number multiple of the empirical formula.
Example: The simplest formula for Butane is C2H5 and its Molecular mass is about 60 g/mol. What is the molecular formula of butane.
Mass of C2 H5 is (12.0
2) + (1.0
5) = 29
60/29 = 2
Molecular Formula is C4H10