Answer:
AS ACCORDING TO THE LAW OF MASS CONSERVATION
REACTANTS =PRODUCTS
THEREFORE,
223.4+96=MASS OF FE2O3
=319.4 FE203
I need to know a little more and maybe I can help
1) The question is incomplete. What is the compound which Fe(ClO4)2 reacts with?
It could be one of several salts.
2) Assuming it is Na2S the complete reaction is:
<span> Fe(ClO4)2 (aq) + Na2S(aq) → FeS (s) + 2NaClO4 (aq)
So, the next steps how how to work this problem assuming that reaction.
3) Show the ionic compounds as separate ions.
</span><span>
Fe(2+) (aq) + 2 ClO4(-) (aq) + 2 Na(+) (aq) + S(2-) (aq) → FeS(s) + 2 Na(aq) + 2 ClO4(-) (aq)
That is the total ionic equation.
4) Cancel the ions that appear on both sides of the equation , Na(+) and ClO4(-).
Fe(2+) (aq) + S(2-) (aq) → FeS(s) <-------- this is the net ionic equation
What happens to sodium and perchlorate is that they do not participate in the reaction but remain dissolved which is called "spectator ions".</span>
Answer:
2.4mol
Explanation:
In order to calculate numbers of moles we have to divide the given mass by the molar mass of the substance (ibuprofen) n= m/M
To calculate the molar mass we have
C13= 12*13= 156
H18= 1*18=18
O2= 16*2 =32
Molar mass M = 153+18+32= 206g
Given the mass m= 250g per tablet
Hence number of moles in one tablet is n= 250/206= 1.2 mol
Therefore the total number of ibuprofen you took is 1.2*2 (for the two tablets) = 2.4 moles
Answer is: c. MgSO₃.
In magnesium sulfite, magnesium has oxidation number +2, sulfur has oxidatidion number +4 and oxygen -2:
+2 + (+4) + 3·(-2) =0.
a) in calcium sulfide, calcium has oxidation number +2 and sulfur -2:
+2 + (-2) = 0.
b) in sodium nitride, sodium has oxidation number +1 and nitrogen -3:
3 · (+1) + (-3) = 0.
d) in aluminium nitrite, aluminium has oxidation number +3, nitrogen +3 and oxygen has -2:
+3 + (+3 + 2 · (-2)) · 3 = 0.
