+ FA 3.9A Question 9 of 10 View Policies Current Attempt in Progress How many atoms of hydrogen are found in 7.84 mol of octane, CgH18? Save for Later
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- #2 acomPound is comPosed of 54.5070 Oxygen, 4.58% H and 40.92% C by Mass a)if the comPound has a t formula weight ot | 14.124a moi, what is the molecular formula of this compound? O How many Curbon atoms are Present n a 135g of this Compound? Somple(pe), ODH 2. a) How many moles of CO, are in 68.0 g of CO,? 29lom 00.0 spbong od for b) How many atoms of potassium are in 0.150 moles of potassium? o boviupen s c) How many moles of Cl, are in 5000 molecules of Cl,? 0.08 9T vlotelgmos HCIO amg vonm wo SLA To oale d) How many grams of sodium are in 0.820 moles of Na,SO ? e) How many moles of oxygen atoms are in 125 g of Ba, (PO,),? 4 2 f) How many formula units of K,S are in 85.0 g of K,S? ICIO g) What is the average mass in grams of a NH, molecule? h) What is the average mass in atomic mass units of a cobalt atom? ulo for each of the following compounds givenSuppose 2.60 g of chlorine, Cl2, are used to prepare dichlorine pentoxide, Cl205. How many moles of oxygen, O, are needed? i mol eTextbook and Media Hint How many grams of oxygen are needed? i g Hint
- Why can't the empirical formula for diphenyl ether be simplified any futhur? Shouldn't it be C6H5O?What is the empirical formula for C4H10O2? O C₂H5O O CH2O O C₂H4O O CHO2 O CHOIf the lower pie chart was drawn asthe percentage in terms of number ofatoms rather than the percentage interms of mass, would the hydrogenslice of the pie get larger or smaller?
- Spring 2021 7. An unknown solvent DHB, contains 49.02% C, 2.74% H, and 48.24 % chlorine. If the molar mass is 8 293.87 g/mol, what is the empirical formula and molecular formula of this compound? tvai a Hune alri tol (n ni) digesisvEw odt Las vo o odh imsts nadw idgil sesol 1vow isle i cas bna mote nogonb d ot ot d r giortaolsWhich of the following is not an empirical formula C2H6 C2H CH3 CH72 F Sunny Determine the number of atoms of O in 57.4 moles of Al₂(CO3)3. H a Question 11 of 14 I 4 7 +/-
- Cyclopropane is an interesting hydrocarbon. Instead of havingthree carbons in a row, the three carbons form a ring, asshown in this perspective drawing (see Figure 2.18 for a priorexample of this kind of drawing):Cyclopropane was at one time used as an anesthetic, but itsuse was discontinued, in part because it is highly flammable.(a) What is the empirical formula of cyclopropane? Howdoes it differ from that of propane? (b) The three carbon atomsare necessarily in a plane. What do the different wedgesmean? (c) What change would you make to the structureshown to illustrate chlorocyclopropane? Are there isomers ofchlorocyclopropane?How many atoms are there in 75 molecules of acetic acid, CH3CO2H? A compound contains, by mass, 40.0% carbon, 6.71% hydrogen, and 53.3% oxygen. A 0.320 mole sample of this compound weighs 28.8 g. The molecular formula of this compound is: (a) C2H4O2 (b) C3H6O3 (c) C2H4O (d) CH2O (e) C4H7O2Wondershare PDFelement Pro File Edit View Tool Go Window Help 69% [4) A АВС Wed 1:12 PM 7.(a) Compound X has the following percentage composition by mass: C: 38.9% ; H: 5.4% ; Cl: 38.4%; O: 17.3% (i) Calculate the empirical formula of X. (Relative atomic mass of C = 12; H = 1; Cl= 35.5; O= 16.0) C H Cl % by mass of atoms relative no. of mole of atoms (= % by mass ÷ relative atomic mass) simplest mole ratio of atoms (divided by the smallest no. of mole) The empirical formula of X is (ii) Find out the molecular formula of X if the relative molecular mass of X is 92.5. (c) If X is an optically alkanal, give the structural formula X and draw this pair of enantiomers. Structural formula of X : (b) If X has a C=C bond and a saturated OH group (i.e. The OH group does not attach to the C=C), give the structural formula of X if X shows cis-trans isomerism. Draw the pair of cis-trans isomers. Structural formula of X :