Chemistry test

what is the freezing point depression of 14.72 g of C2H4(OH)2 ethylene glycol dissolved in 6.7 L of water?

-0.066 *C

percent difference of NaCl if actual measure mass is 76.22 g and the stiochiometrically calculated mass is 77.21 g

-1.282%

if the pH of an H2SO4 solution is 1.56 what is the molarity?

0.0275 M

what is the molarity of 3.000 L solution of ammonium chloride NH4Cl prepared by using 60.00 mL of a 2.76 M NH4Cl stock solution?

0.05520 m NH4Cl

what is the molarity of 33.8 mL of a KOH analyte if i took 12.6 mL of a 1.5 M HCl titrant to neutralize it?

0.559 M KOH

what is the Keq of the reaction N2+3H2 <-> 2NH3 if the concentration of N2 concentration of H2 and the concentration of NH3 is 1.7 x 10^-2

1.2 x 10^6

what is the Keq of the reaction N2+3H2 <-> 2NH3 if the concentration of N2 is 1.8 x 10^-2 and the concentration of H2 is 2.4 x 10^-3 and the concentrations of Nh3 is 1.7 x 10^-2

1.2 x 10^6

using the Ksp Table above, calculate the concentration of the Ag ion in silver carbonate

1.3 x 10^-4

what is the pH of the analyte of 0.559?

13.75

if 4.98 mol of Co2 in an excess og H2O reacted inside a papaya leaf in sunlight how many grams of glucose will be produced

150. grams C6H12O6

use the henderson-hasselbalch equation to find the Ka of a buffer solution of 0.25 M HCNO and 0.17 M sodium cyanate whose pH was found to be 4.3

3.4 x 10^-5

what volume of a 0.55M HNO3 titrant is needed to neutralize 32.7 mL of a 0.75 M NaOH analyte?

44.6 mL HNO3

what is the Ksp of Al(OH)3 whose concentration 1.17 x 10^-2? Does it precipitate?

5.06 x 10^-7

if the Ksp value of CaCO3 is 2.8 x 10^-9 what is the concentration of the Ca ion?

5.3 x 10^-5

use a RICE table to find the Ka of a 0.129 M HC2H2ClO chloroacetic acid solution whose pH is 2.02

7.64 x 10^-4

what is the maximum volume of a 0.5 M acetic acid solution that can be made using 12.6 mL of a 3.0 M stock acetic acid HCH3COO solution?

75.6 mL

which of the salts in the table above is the most soluble

MgCO3

what mass of glucose C6H12O6 would be required to prepare 4.50 x 10^3 L of a 0.215 M solution?

174,000 g C6H12O6

moles of KCLO are needed to react completely in order to produce 16.4 mol of O2

10.9 mol of KCLO3

what is the new boiling point of water in a radiator when 205.6 g of C2H4(OH)2 is added to 5.8 kg of water?

100.3 *C

when the phenolphthalein indicator turned clear the final volume of a 2.8 M HCl titrant was 32.8 mL what was the original volume of that titrant used to neutralize 28.4 mL of a 1.4 M NaOH analyte?

18.6 mL HCl

what is the pH of a 0.005 M HCl solution?

2

how many moles of Cl2 are in a 456.8 mL container whose pressure is kept at 2.5 atm and 322.6 K?

0.043 mols Cl2

how many grams of water will be produced in the reaction of 42.6g of NaOH and 35.7 mL of 1.2 M HCl?

0.771 g H2O

0.49 g Cu was reacted with 2.56 g AgNO3 how many grams of Ag will be produced

1.63 g Ag

determine the molality of a non electrolytic solution of 460. g of acetone CH3COCH3 in 720. g of water

11.0 m CH3COCH3

how many grams of calcium chloride must be dissolved in 875. mL of dH2O to make a 1.2 M CaCl2 solution from scratch?

117 g CaCl2

calculate the pressure in kPa of a gas 35.8*C?

137 kPa

what is the pH of a 1.5 M NaOH solution?

14.18

what is the pOH of a 2.5 M HCl solution?

14.40

when you calculate the Ksp of calcium fluoride CaF2 if the concentration of the F ion is 4.2 x 10^-4 then the concentration of the Ca^2 ion is

2.1 x 10^-4

what is the molality of a solution with 34.6 g of methanol CH3OH dissolved in 45.8 g of H2O?

23.6 m CH3OH

if 408.46 g of Fe2O3 reacted completely, in an excess of CO how many grams of Fe were produced

285.69 g Fe

what is the H concentration of an acidic solution if its OH concentration is 2.6 x 10^-12?

3.8 x 10^-3

what is the pressure in torr of 12.06 g of H2 in a 31.2 L container at 22.4 *C?

3530 torr

what is the temperature in Kelvins of 0.0062 mol of H2 when its pressure is 103.7 kPa and its volume is 182.7 mL?

367.5 K

if a person has a lung capacity of 2.12 dm3 what would her body temperature be in *C if there were exactly 0.0839 moles of N2 and the atmospheric pressure that day was 102.09 kPa?

37*C

use the henderson-hasselbalch equation to calculate the pH of a 1.0 L buffer solution made a 0.25 M benzoic acid and 0.15 M sodium benzoate the Ka of benzoic acid is 6.5 x 10^-5

4.0

use a RICE table to calculate pH of a buffered 0.35 M HCH3COO solution to which enough of a 0. 25 M NaCH3COO buffer is added to make 1.0 L of solution the Ka of acetic acid is 1.75 x 10^-5

4.6

what is the volume of O2 gas produced in a reaction where 0.24 mol of the oxygen are at 1.22 atm in a container whose temperature is maintained at 334.6 K?

5.40 L

what is the OH of a basic solution whose is 1.8 x 10^-13?

5.6 x 10^-2

how many milliliters of CO2 gas are generated in a reaction where 98.4 g of the carbon dioxide gas are kept at STP?

50,100 mL CO2

what is the pressure in torr of 282.9 g of SO2 gas in a 12.8 L container held at 37.6 *C for one hour?

6,690 torr

how many liters ethylene glycol C2H4(OH)2 are needed to protect a car engine to 108.*C if the cooling system capacity is 6.7 L of water?

8 L C2H4(OH)2

what is the maximum volume of a 1.5M acetic acid solution that can be made using 1.52 mL of a 8.00M acetic acid HCH3COO stock solution

8.11 mL HCH3COO

what mass of magnesium bromide would be required to prepare 720.mL of a 0.0726 M aqueous solution?

9.62 g MgBr2

which of the following salts is least soluble?

AgI Ksp=8.3 x 10^-17

which of the following Keq expressions is correct for the formation of ammonia NH3 from its elements as represented by the equation 3H2+N2-->2NH3+92 kj?

NH3^2/H2^3 N2