Answer for question 3. Show work. Dates CHE1104 Principles of Chemistry I Midter

Question

Answer for question 3. Show work.

Dates CHE1104 Principles of Chemistry I Midterm Lecture Examination (A) Questions (Please show the work for each of the questions in part I!) 1. For the following ionie compound, write the symbols for the ions present, and give the number of each: Li CO. (12 points) 2. You have 180 g of oxalic acid, HC04. (5 points each, 10 points in total) 1) What amount (moles) is represented by 180 g of oxalic acids? 160 g Y oka.c males How many molecules of oxalic acid are in 80g? nmks) 2) mole 2 x1oz?w.lec uve,s( ) Aogoldth fir Igog; no ·hulec..k; 182tg)xG-oz o33 12.oyx1023 ww.lecults Cg) The empirical formula of a substance is CH20. If its molar mass is 120.05 gmol, what is the molecular formula of the substance? (12 points) 3· Page 1 of 4

Explanation / Answer

Since, the molar mass of CH2O is 12+(12)+16=30 and the molar mass of the molecular formula is 120.05.

Then,

120.05/30=4

and then get (CH2O)4=C4H8O2

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