this is the most helpful answer i found online when doing this problem...
a) A characteristic odor of pineapple
first lets find the mass of carbon & hydrogen, using molar masses:
6.3mg CO2 @ 12 mg C / 44mg CO2 = 1.72 mg Carbon
2.58 mg H2O @ 2.02mg H / 18.02mg H2O = 0.29 mg Hydrogen
now lets find mg of oxygen:
2.78mg total - 1.72mg Carbon - 0.29 mg Hydrogen = 0.77mg Oxygen
now let's find mmoles:
1.72mg Carbon @ 1mmol/ 12mg = 0.143mmol C
0.29 mg Hydrogen @ 1mmol/1mg = 0.29mmol H
0.77mg Oxygen @ 1mmol / 16mg = 0.048mmol O
dividing by the smallest to get a ratio of moles;
0.143mmol C / 0.048mmol = 3.0 moles Carbon
0.29mmol H / 0.048mmol = 6.0 moles Hydrogen
0.048mmol O / 0.048mmol = 1 mole oxygen
your first answer : C3H6O
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b)Nicotine
first lets find the mass of carbon & hydrogen, using molar masses:
14.242mg CO2 @ 12 mg C / 44mg CO2 = 3.884 mg Carbon
4.083 mg H2O @ 2.02mg H / 18.02mg H2O = 0.458 mg Hydrogen
now lets find mg of nitrogen:
5.250 mg total - 3.884 mg Carbon - 0.458 mg Hydrogen = 0.908mg nitrogen
now let's find mmoles:
3.884 mg Carbon @ 1mmol/ 12mg = 0.324 mmol C
0.458 mg Hydrogen @ 1mmol/1.01mg = 0.453mmol H
0.908 mg nitrogen @ 1mmol / 14mg = 0.0648 mmol N
dividing by the smallest to get a ratio of moles;
0.324 mmol C / 0.065mmol = 5 moles Carbon
0.453 mmol H / 0.065mmol = 7 moles Hydrogen
0.065 mmol O / 0.065mmol = 1 mole nitrogen
next answer: impirical formula: C5H7N1
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the formula C5H7N1 has
5C's @ 12 ea = 60
7 H's @ 1 ea = 7
1 n @ 14 = 14
the mass totals 81
so If the substance has a molar mass of 160+/- 5g,
then the molecular formula has twice the atoms...
your last answer : molecular formula = C10H14N2
C3H6O the 3 and 6 are subscripts
X3Y is the empirical formula
NaF is the empirical formula
CH2O because you have to divide by the number they all have in common which is 6
An empirical formula refers to the chemical formula that indicates the simplest ratio of atoms in a compound. Two different compounds may have the same empirical formula.
C3H6O the 3 and 6 are subscripts
X3Y is the empirical formula
The empirical formula is representative for the chemical composition of a compound; the structural formula is representative for the spatial structure of the compound.
An empirical formula has no data about the structure of a compound.
NaF is the empirical formula
CH2O because you have to divide by the number they all have in common which is 6
the empirical formula of a compound tells you the proportions of the elements in the compound. with that information you can make some inferences about the identity of the compound. for example a compound with an empirical formula CH4 tells us that for every carbon atom there are four hydrogen atoms. this means that the compound is methane because no other hydrocarbon can have these roportions (try drawing the lewis structure for C2H8, which doesnt exist. you cant!)
an empirical formula For an ionic compound, the empirical formula is called a formula unit.
An empirical formula is elaborated after the chemical analysis of a compound; for a structural formula more in depth studies are necessary.
An empirical formula refers to the chemical formula that indicates the simplest ratio of atoms in a compound. Two different compounds may have the same empirical formula.
The empirical formula of a compound is the simplest whole number ratio of the elements in the compound. In C75H25, the ratio of carbon to hydrogen is 75:25, which is equal to 3:1. Thus, the empirical formula is C3H.
Yes. An empirical formula is the simplest ratio of the elements in a compound.