Empirical Formula Chemistry Question 1) An organic compound X, which contains carbon, hydrogen and oxygen only, has an Mr of 85. When 0.43g of X are burned in excess oxygen, 1.10g of carbon dioxide and 0.45g of water are formed. Find the empirical and molecular formulae of compound X. 2) When ammonium dichromate (VI) is added gradually to molten ammonium thiocyanate, Reinecke's salt is formed. It has the formula NH4[Cr(SCN)x(NH3)y] ** and the following composition by mass: Cr = 15.15%, S = 38.15%, N=29.2%. Calculate the values of x and y in the above formula It's alright if you just give me the steps and not the answers, I don't mind. I've done the rest of the sheet, these questions just stand out a little. **note that the numbers in the formula should be subscript.

Expert Answers

An illustration of the letter 'A' in a speech bubbles

Moles of C, H and O can be calculated as:

Moles of C =  moles of CO2 = 1.1 gm/44 gm = 0.025 moles C = 0.025 x 12 gm = 0.3 gm C

Moles of H = 2 x moles of water = 2 x 0.45/18 moles = 0.05 moles H = 0.05 gm H

Mass of oxygen...

(The entire section contains 106 words.)

Unlock This Answer Now

Start your 48-hour free trial to unlock this answer and thousands more. Enjoy eNotes ad-free and cancel anytime.

Start your 48-Hour Free Trial
Approved by eNotes Editorial Team