Question

If anyone can show me how these are solved I would appreciate it, answers included though please.

16.) Which of the follow conatin the GREATEST number of MOLES of OXYGEN. Show your work.

0.50 mol P4010, 1.5mol P2O5, 2.5mol CO2, 2.0mol N2O4   

20.) Ibuprofen has a chemical formula C13H1802. When the equation is properly balanced what is a correct mole ratio of CO2 to H2O in the reaction?

21.) 4Al(s) + 3O2(g) ---> 2 Al2O3 (s) If 10.0 mol of aluminum is converted to Al oxide, how many moles of Al2O3 are produced?

23.) What MASS of NaOH is need to make 450mL of a 2.0 M solution. SHOW your work.

Answer 1

16) P4O10 contains 5 moles O2

as Oxygen is O2 so 5*O2 = O10

here given 0.5 moles = 0.5 *5 = 2.5 moles

..............................................................................

P2O5 contains 2.5 moles of O2

here 1.5 moles of P2O5 so 1.5*2.5 = 3.75 moles

.............................................................................

in 2.5mol CO2

2.5*1 = 2.5 moles of O2

......................................................

,in 2.0mol N2O4   

in N2O4 2moles of O2

so given 2moles

2*2 = 4moles of O2

so 2 moles of N2O4 contains greatest no.of moles of oxygen

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20)

26CO2+18H2O..............>2C13H18O2+33O2
the ratio is 13:9

21) 4Al(s) + 3O2(g) ---> 2 Al2O3 (s)

   4 moles of Al is giving 2 moles of Al2O3

10 moles of Al ......................................?

= 10*2/4 = 5 moles of Al2 O3 produced.

23) M = (wt/mol.wt)*(1000/vol. in ml)

2    =( wt/40)*(1000/450)

wt   = 1000 gm of NaOH