of 1 mole of a monatomic gas is increased from 25°C to 300°C. 3.20 One mole of an ideal gas undergoes an isotherma expansion at 300 K from 1.00 atm to a final pressure while performing 200 J of expansion work. Calculate the final pressure of the gas if the external pressure s 0.20 atm. Heat Capacities 3.21 A 6.22-kg piece of copper metal is heated from 20.5° C to 324.3°C. Given that the specific heat of Cu is 0.385 J g1 °C-1, calculate the heat absorbed (in kJ) by the metal. 3.22 A 10.0-g sheet of gold with a temperature of 18.0°C is laid flat on a sheet of iron that weighs 20.0 g and has a temperature of 55.6°C. Given that the specific heats of Au and Fe are 0.129 J g-1 C-1 and 0.444 Jg-1 oc1, respectively, what is the final temperature of the combined metals? Assume that no heat is lost to the surroundings. (Hint: The heat gained by the gold must be equal to the heat lost by the iron.) 3.23 It takes 330 joules of energy to raise the tempera- ture of 24.6 g of benzene from 21.0°C to 28.7°C at con stant pressure. What is the zene at constant pressure? 3.24 The molar heat of vaporization for water is 44.0 kJ mol-1 at 298 K and 40.79 kJ mol- qualitative explanation of th values. molar heat capacity of ben- 1 at 373 K. Give a e difference in these two 3.25 The constant-pressure molar heat capacit y of ni-

7. How many moles are contained in each of the following? A. 21.0 gg CaCa Express your answer using three significant figures.   B. 5.30 gg SS Express your answer using three significant figures.   C. 40.0 gg H2OH2O Express your answer using three significant figures.

32. A lotion vehicle contains 15% v/v of glycerin (sp gr 1.25). How much glycerin should be used in preparing 5 gallons of the lotion? a. 2271 g glycerin b. 3339.7 mL glycerin c. 2671.8 g glycerin d. 3548.4 g glycerin

3. State how many significant figures are proper in the results of the following calculations. a. (106.7)(95.6)(46.210)(1.01)   b. (18.7)2   c. (16.0 ✕ 10−20)(3712)

show stereochemistry 1. PBr3 Na H CH 1. T3-C ܕܐ ܕ O Na show stereochemistry

Consider the reaction between solid scandium oxide and hydrogen chloride (HCl) gas to form solid scandium chloride and liquid water (the only cation that scandium [Z = 21] can form has a charge of +3).   How much scandium chloride (in grams) can be formed if 11.4 g of scandium oxide and 66.7 g of hydrogen chloride gas are placed in a reaction vessel? (3 sf)

DATA 1. Mass of empty beaker 2. Volume of NaCl solution 3. Mass of beaker and NaCl solution 4. Mass of beaker and dry NaCl CALCULATIONS (show all of your work) 5. Mass of NaCl solution (mass of beaker and NaCl solution - mass of beaker) 62. 249.79. 6. Mass of dry NaCl (mass of beaker and dry NaCl-mass of beaker) 55.29-49.79= 7. Mass percent of NaCl solution (mass of dry NaCl / mass of NaCl solution x 100) 5.59g/12.59 x 100 = O 12 49.7 10.0 62.2 55.2 12.5 5.59 8. Mass/volume percent of NaCl solution (mass of dry NaCl / volume of NaCl solution x 100) 5.59/10.69 x 100 = 55.9 44.72 55.9 ||| g mL g g g g % (m/m) % (m/v) O 11

i just need subparts B and C please

A. Provide the correct arrows for the following reactions: 1. 3. A. CH₂CH₂ OH + + (CH₂)₂CHOH + CH₂CHCH₂ H.C H H Br H₂C CH₂ -+ H.C. H-CI H-Br CH₂ d-f H OH CH₂CHCH₂ CH₂CH, + H X--X• CH₁ H₂C-C Br CI *CH(CH3)2