Determine the empirical fromula of kelvar, used in making bullet proof vests, is `70.6% C,4.2% H,11.8%N and 13.4%O`:

Determine the empirical formula of kelvar, used in making bullet proof vests, containing 70.6% C,4.2% H,11.8%N and 13.4%O :

Give the empirical formula of C4H8

Give the empirical formula of C2H4

Determine the empirical formula of a compound having percentage composition as : Iron = 20% , sulphur = 11.5% , oxygen = 23.1% and water molecules = 45.4% -(At. mass of Fe = 56, S = 32)

A compound X consists of 4.8% carbon and 95.2% bromine by mass. Determine the empirical formula of this compound working correct to one decimal place (C = 12, Br = 80)

The compound adrenaline is released in the human body in times of stress. It was found by experiment to have the composition 56.8 % C, 6.50 % H, 28.4% O and 8.28% N. What is the empirical formula of adrenaline?

If the elemental composition of butyric acid is found to be 54.4% C, 9.13% H, and 36.5% O, determine the empirical formula.

Aspirin contains 60% C, 4.48% H and 35.5% O. Its empirical formula is