7. Rewrite and balance the following equations. (16 points) SO3(g) + 02(g) SO.(g
ID: 227729 • Letter: 7
Question
7. Rewrite and balance the following equations. (16 points) SO3(g) + 02(g) SO.(g) a. b. Casio,(s) + HF(g) Sir(g) + Car,(s) + H2O(l) c. Sc0,(s) +HO) Sc(OH)3(s) e. BC13(g) + H2O(I) H3B03(s) + HCl(g) f. Fe(s) + H2O(l) Fe,04(s) + H2(g) g. Chhoods) + 02(g) CO2(g) + H2O (g) 8. Cortisol (362.74 g/mol) is a steroid hormone involved in protein synthesis. Medically, it has a major use in reducing inflammation from rheumatoid arthritis. Cortisol is 696 % C, 8.46% H, and 22.1 % O. Calculate the following. (10 points) What is the empirical formula of Cortisol a. b. What is the empirical mass of Cortisol c. What is the molecular formula of CortisolExplanation / Answer
7. The balanced equations are,
(a)
2 SO3 + O2 -----------> 2 SO4
(b)
CaSiO3 (s) + 6 HF (g) -----------> SiF4 (g) + CaF2 (s) + 3 H2O (l)
(c)
Sc2O3 (s) + 3 H2O (l) -----------> 2 Sc(OH)3 (s)
(d)
6 S2Cl2 (l) + 16 NH3 (g) -----------> S4N4 (s) + S8 (s) + 12 NH4Cl (s)
(e)
BCl3 (g) + 3 H2O (l) ----------> H3BO3 (s) + 3 HCl (g)
(f)
3 Fe (s) + 4 H2O (l) -----------> Fe3O4 (s) +4 H2 (g)
(g)
C6H10O5 (s) + 6 O2 (g) -------------> 6 CO2 (g) + 5 H2O (g)
(h)
P4O10 (s) + 6 H2O (l) ------------> 4 H3PO4 (aq.)
8.
Element Mass Number of moles Division by small number Nearest whole number
C 69.6 69.6 / 12 = 5.80 5.80 / 1.38 = 4.2 4.2 * 5 = 21
H 8.46 8.46 / 1 = 8.46 8.46 / 1.38 = 6.12 6 * 5 = 30
O 22.1 22.1 / 16 = 1.38 1.38 / 1.38 = 1.00 1 * 5 = 5
(a)
The emperical formula = C21H30O5
(b)
Emperical formula mass = 21 (C) + 30 (H) + 5 (O) = 21 (12) + 30 (1) + 5 (16) = 362 g/mol
(c)
n = molecular mass / emperical formula mass
n = 362.74 / 362
n = 1.002
n = 1 (approxi.)
Molecular formula = [Emperical formula]n = [C21H30O5]1 = C21H30O5
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