Monday, November 16, 2009

In the above equation, 4 moles of silver nitrate would produce how many moles of ferrous nitrate.?

Fe+2AgNO3 ---%26gt;Fe(NO3)2+2Ag


a)3 moles


b) 4 moles


c) 1 mole


d) 2 moles





2)What is the oxidation number of K in KClO4?


a)+4


b) -1


c) +2


d) +1


e) -7





3)5,400 moles of P4O10 has a mass of:


a)52.57 g.





b)1599982 g.





c)106965425 g.





d)1532412 g.





4)Which conversion factor below would be used to change liters of oxygen gas to moles of oxygen gas?


a)22.4 mol gas = 1 L





b)22.4 L = 1 mol gas





c)6.02 x 1023 mol gas = 1 L





d)6.02 x 1023 L = 1 mol gas





6)Chemical properties of hydrogen compounds can have vast differences depending on the state of matter that the substance is in - solid, liquid or gas. The difference in chemical properties is related to


a)the dissociation of H+ from the hydrogen compound into solution.





b) the dissociation of OH- from the hydrogen compound into solution.





c )the energy threshold required to break the covalent bonds in the solid.





d)the slight cohesion of the liquid solvent forming the aqueous soluti

In the above equation, 4 moles of silver nitrate would produce how many moles of ferrous nitrate.?
I cant help you with all the questions but here goes.


1)d because its 1/2 judging by the mole ratio in the equation


2)The oxidation no. of combined oxygen is -2 so all together the oxygen is -8. The Cl is tricky so not sure where to go from there, sorry.


3) Im not sure where you got your answers from but none of them seem to be correct. The answer should read 1532952g which is actually pretty close to some of them, but not exact. This is using the relationship that n=m/M so you get m=5400x283.88(molar mass of P4O10).


4)b


Wasnt really sure with the rest so didnt wanna lead you in the wrong direction. Hope that helps.

frangipni

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