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'+ 16.00 = 31.03. Therefore the molecular formula is twice the empirical formula: C2H6O2. A sample with a molar mass of 34.00 g/mol is found to ...
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Dec 7-7:31 AM
Warm up
Define molar mass
How many mols are in 24.0 grams of C
How much does half a mol of water weigh?
Nov 16-7:26 AM
More Practice:
What is the molar mass of C 2 H 7 given to 3 sig figs?
How many mols of C 2 H 7 are in 321g?
What is the percent weight of C in C 2 H 7?
4)How many grams would 0.750 mols of C 2 H 7 weigh?
Nov 16-7:31 AM
Molecular vs Empirical Formulas
Empirical formulas are the ratio of atoms in a molecule
Molecular formulas are the COMPLETE number of atoms in an element.
Nov 16-7:32 AM
Examples
Empirical formula of CH
This means that for every atom of carbon,
there is one atom of hydrogen.
Molecular formulas with the same ratio -
acetylene - C 2 H 2
benzene - C 6 H 6
Nov 16-7:39 AM
Solution
(C3H7)2 or C6H
Nov 16-7:37 AM
The compound ethylene glycol is often used
as an antifreeze. It contains 38.7% carbon,
9.75% hydrogen, and the rest oxygen. The
molecular weight of ethylene glycol is 62.07 g.
What is the molecular formula of ethylene
glycol?
Nov 16-8:46 AM
Therefore the molecular formula is twice the empirical formula: C 2 H 6 O 2.
Dec 7-7:33 AM
A sample with a molar mass of 34.00 g/mol is found to consist of 0.44g H and 6.92g O. Find its molecular formula.
Dec 7-7:37 AM
The molar mass of a compound is 92g/mol. Analysis of a sample of the compound indicates that it contains 0.606g N and 1.390g O. Find its molecular formula.
Dec 7-7:37 AM
Determine the molecular formula of a compound with an empirical formula of NH and a formula mass of 32.06 g/mol.
Dec 7-7:37 AM