SAT Subject Test Chemistry,10 edition

(Marvins-Underground-K-12) #1
is  true    regarding   the reaction?

When    the reaction    is  complete,   the concentrations  of  both    magnesium   and
phosphate are essentially 0.

(A)


(B) Magnesium   nitrate is  the limiting    reactant.
(C) Sodium phosphate is the limiting reactant.
Since nitrate ion is a spectator ion, the concentration of nitrate ion in the final
solution will be the same as in the original magnesium nitrate solution.

(D)


(E) Na 3 PO 4   and Mg(NO 3 ) 2  react  in  a   1:1 ratio.

58 . ....Na 3 PO 4 (aq) + ....Mg(NO 3 ) 2 (aq) →


....Mg 3 (PO 4 ) 2  (s) +   ....NaNO 3  (aq)

Equal   volumes of  0.10    M   sodium  phosphate   and 0.10    M   magnesium   nitrate are mixed
according to the unbalanced reaction equation above. When the reaction is complete,
what is the concentration of sodium ions in the solution?

(A) ~0  M,  because all the sodium  ions    will    precipitate
(B) 0.05 M
(C) 0.10 M
(D) 0.15 M
(E) 0.30 M

59 . Determine the heat of reaction for the combustion of sulfur dioxide


2   SO 2     (g)    +   O 2     (g) →   2SO 3   (g)
given the following thermochemical equations:

I. S 8 (s)  +   8   O 2 (g) →   8   SO 2 (g)    ΔH  =   −2374.6 kJ
II. S 8 (s) + 12 O 2 (g) → 8 SO 3 (g) ΔH = −3165.8 kJ
Free download pdf