To determine the empirical formula of the compound given, we need to determine the ratio of each element in the compound. To do that, we need to know the amount of carbon, hydrogen and oxygen atoms in the compound. We determine these from the given amounts of the products after burning.
Given: 2.5 g vanillin 5.79 g CO2 1.18 g H2O
Solution:
mol C = 5.79 g CO2 ( 1 mol CO2 / 44.01 g CO2) ( 1 mol C / 1 mol CO2) = 0.132 mol C
mol H = 1.18 g H2O ( 1 mol g H2O / 18.02 g H2O) ( 2 mol H / 1 mol H2O) = 0.131 mol H
We convert them into grams, 0.132 mol C (12.01 g / 1 mol) = 1.59 g 0.131 mol H (1.01 g / 1 mol) = 0.132 g mass of C and H in vanillin = 1.722 g mass of O = 2.5 - 1.722 = 0.778 g O
mol O = 0.778 g O ( 1 mol O / 16 g ) = 0.049 mol O
Dividing the number of moles of each element with the smallest value of number of mole, we will have the empirical formula:
moles ratio C 0.132 / 0.049 2.69 x 3 = 8 H 0.131 / 0.049 2.67 x 3 = 8 O 0.049 / 0.049 1 x 3 = 3
If the egg is fertilized by a man's sperm, the resulting embryo would travel down the fallopian tube and implant in the uterus. This happens around the 20th day of the menstrual cycle. ... Around day 26 of your cycle, the uterus will begin the process to shed its lining causing menstruation to begin
