Given the reaction: CH4 + 2 02 yields CO2 + 2 H₂O How many oxygen atoms go INTO the reaction? O 16 32 04 02 QUESTION 2

[References] ot A sample of calcium metal with a mass of 2.06 g was reacted with excess oxygen. The following equation represents the reaction that took place: ot 2Ca(s) + O2 (g) → 2CaO(s) The isolated product (CaO) weighed 2.25 g. What was the percentage yield of the reaction? ot ot Percentage yield ot

Question 25 of 97 Submit DDT was an insecticide used to prevent mosquito borne diseases. Due to the harmful effects on birds and fish, it is now banned in the US. However, other countries still use it to control mosquitos. It can be prepared by the reaction shown below. Determine the amount of DDT that can be produced and the percent yield for this reaction. 2C6H,CI + C2HOCI, – C,4H9CI, + H20 2 3 NEXT If a company in South America started with 1175 g of chlorobenzene (C6H5CI, MW 112.55 g/mol) and 538.5 g of chloral (C2HOCI3, MW 147.39 g/mol), set up the table below that represents 100% yield with the given reaction conditions. 2C6H,CI C2HOCI, C1.H,Cls H2O Before (mol) Change (mol) After (mol) O RESET 3.132 -3.132 3.654 -3.654 7.308 0. + -7.308 10.44 -10.44 MacBook Air F12 II F8 F10 F11 000 F9 20 F3 F7 F4 F5 F6 esc F2 F1 +.

5. An organic compound containing only C, H, and possibly O was subjected to combustion analysis. A sample weighing 0.7585 g yielded 1.295 g CO₂ and 0.464 g H₂O. What is the empirical formula of the compound?