OO Verizon LTE 12:14 PM webassign net WebAssign. Wed Feb. 11th Homework Assignme

Question

OO Verizon LTE 12:14 PM webassign net WebAssign. Wed Feb. 11th Homework Assignment Submission For this assignment, you submit answers by question parts. The number of submissions remaining for each question part only changes if you submit or change the answer, Assignment Scoring Your last submission is used for your score Give the empirical formula of each of the following compounds if a sample contains the following quantities of each element. (See the periodic table.) (a) 0.0130 mol C, 0.0390 mol H, and 0.0065 mol O (b) 46.64 g iron and 13.36 g oxygen (c) 54.5% C, 9.2% H, and 36.3% O by mass Supporting Materials Periodic Table

Explanation / Answer

a)

divide by the smallest number
0.013/ 0.0065 = 2 => C
0.039/ 0.0065 = 6 => H
0.0065/ 0.0065 = 1 => O

C2H6O

b)
moles Fe = 46.64 g/ 55.847 g/mol=0.8351
moles O = 13.36 g/ 15.999 g/mol=0.8351
the ratio is 1 : 1 and the formula is FeO

c)

moles C=54.5/12=4.54

moles H=9.2/1=9.2

moles O=36.3/16=2.26

C=4.54/2.26=2

H=9.2/2.26=4

O=2.26/2.26=1

C2H4O

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