Question

An organic compound on analysis gave the following composition
1) carbon=40%
2) hydrogen=6.66%
3) oxygen=53.34%
Calculate it's molecular formula if it's molecular mass is 90

Answer 1

Answer:

An acid of molecular mass 104 contains 34.6% carbon, 3.85% hydrogen and the rest is oxygen. Calculate the molecular formula of the acid. What is the simplest formula of the compound which has the following percentage composition: carbon 80%, Hydrogen 20%, If the molecular mass is 30, calculate its molecular formula

Explanation:

Answer 2

Answer:

Explanation:

Assuming the given percentage as grams,

Number of moles of carbon=40/12.01=3.33

"               "              hydregon=6.66/1.008=6.60

"               "              oxygen=53.34/16=3.33

Dividing Number of moles By least value=3.33/3.33=1

                                                                    6.60/3.33=2

                                                                   3.33/3.33=1

Emperical formula=CH2O

Emperical formula mass=12+2+16=30

Molecular mass=90

n=90/30=3

Molecular mass=C3H603