I've been getting in trouble for not doing my homework but my teacher doesn't explain anything and I can't figure out how to do these problems, can someone please help me??
1)balanced reaction: 2Ca+O2(2 is a subscript)=2CaO
You wish to calculate the mass of calcium oxide that can be prepared from 4.20g Ca and 2.80g of O2
a)how many moles of CaO can be produced from the given mass of Ca?
b)How many moles of CaO can be profuced from the given mass of O2
c)What is the limiting reactant?
d)How many grams of CaO can be produced?
2)Calculate the maximum numbers of moles and grams of iodic acid [HIO3(3 is a subscript)] that can form when 685g of iodine trichloride reacts with 131g of water:
reaction: ICl3(subscript)+H2O=Icl+HIO3(subscript)+HCl [unbalanced]
What mass of the excess reactant remains?
PLEASE PLEASE PLEASE HELP! I'm at my wits end, I'm usually an A student and I just got a 49 on my last test!! *drops dead*
2007-04-26 13:01:36 · 1 answers · asked by Ashboo 2 in Science & Mathematics ➔ Chemistry
Moles of Ca = 4.2/40 = 0.105
Moles of O2 = 2.8/32 = 0.099
a) Thus moles of CaO = 0.099
b) 0.198
c) Ca
d) 56*0.099 = 5.544
You are an A student, so what's the big deal ???
2007-04-26 23:34:03 · answer #1 · answered by ag_iitkgp 7 · 0⤊ 0⤋