Physical Science help

ECSteeze

ECSteeze

Member
c'mon i seriously cant figure any of this stuff out. Any help is greatly apreciated.

1. Chromium is produced by reacting it oxide with aluminum.If 76g of Cr2O3 and 27g of Al react to form51g of Al2O3,how many grams of Cr are formed?

2. Propane ,C3H8(g)burns in oxygen to form carbon dioxide and water vapor. Write a balanced equationfor buring propane.

 
do you have their masses? as in the ones on the periodic table

Joel

'Go shut yourself in a freezer and see if you can evolve out of it.' -PhattTim

'i think its funny that they decriminilized both homosexual sex and animal sex at the same time... what kinda message does that send?' -Apple

 
actually, first do a balanced chem. equation. if it turns out that those are the only two products, then shouldnt it be 52 grams? i took chem last year so dont make fun of my skills...

Joel

'Go shut yourself in a freezer and see if you can evolve out of it.' -PhattTim

'i think its funny that they decriminilized both homosexual sex and animal sex at the same time... what kinda message does that send?' -Apple

 
Chromium is produced by reacting it oxide with aluminum.If 76g of Cr2O3 and 27g of Al react to form51g of Al2O3,how many grams of Cr are formed?

Cr2O3 + 2Al --> Al2O3 + 2Cr thats how you balance it... buuuuut... since there are no elements or compounds or extra O2 in the solution, you can use the conservation of mass law, the answer is 52 grams of Cr

-The Dr.-

Live for something, or you will die for nothing.

wc.tl.ln.sm.c.pnwk.tre.tiwiwbtiac.nwft.tcfpa.a.wpc.nsa.fiasmf
 
HA! i was right.

Joel

'Go shut yourself in a freezer and see if you can evolve out of it.' -PhattTim

'i think its funny that they decriminilized both homosexual sex and animal sex at the same time... what kinda message does that send?' -Apple

 
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