9. 500ml of 0.3M HCLO4 is combined with 500ml of 0.2M Ca(OH)2. Calculate the mol

Question

9. 500ml of 0.3M HCLO4 is combined with 500ml of 0.2M Ca(OH)2. Calculate the molarity of H+, CLO4-, Ca+2 and OH- ions after the reaction.

10. Gasoline is used to fuel a 4000 pound car accelerating from 0-55 miles per hour. How many g of C8H18 are needed? Assume perfect efficiency. (hints: 1 kg=2.20 pound, 1 mile=1.61 km, j=kg m^2/s^2; E=1/2 mv^2)

C8H18(l) + 25/2 O2(g)8 CO2(g)+ 9H2O(g) Hrxn=-5074.1kj

11. Chlorine gas has a density d=7.64g/L at temperature T=30°C. What is the pressure in atm?

12. 10 atm of Ne is heatd from 10°C to 120°C. What is the pressure?

13. When of gypsum (calcium sulfate dihydrate also known as sheetrock) is heated to 350°F, water is released as it is converted to anhydrite (calcium sulfate). Sheetrock resists burnin in this way. The water is given off as steam (gaseous water vapor). How many L of steam is released from 23,000g sheet of gypsum wall board at 1 atm and 350°F?

CaSO4 2H2)(s)CaSO4(s) + H2)(g)

14. A 5.0g cooking oil is combusted releasing energy to heat 1000g of water from 21.3°C to 66.3°C. How many nutrition calories (cal) are releasaed from the bread? (1 Cal =1000cal=4180 J)

Explanation / Answer

9. 500ml of 0.3M HCLO4 is combined with 500ml of 0.2M Ca(OH)2. Calculate the molarity of H+, CLO4-, Ca+2 and OH- ions after the reaction.

V = 500 mL = 0.5 L; M = 0.3

mol of HClO4 = MV = 0.3*0.5 = 0.15 mol of HClO4

for base

V = 500 mL = 0.5 L; M = 0.3 --> MV = 0.10 mol of Ca(OH)2

limiting reactant is acid, since 2:1 ratio

so

0.15 mol of HCl react with 0.075 mol of Ca(OH)2 to form

2HClO4 + Ca(OH)2 = Ca(ClO4)2 + 2H2O

Vfinal = V1+V2 = 500+500 = 1000 mL = 1 L

[H+] = 0 since all racts

[ClO4-] = 0.15 / 1 = 0.15 M

[Ca+2] = 0.10 / 1 = 0.10 M

mol of OH left = 2*(0.10 ) - 0.15 = 0.05 mol

[OH-] = 0.05 /1 = 0.05 M

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