(a)
Interpretation:
The symbol
Concept introduction:
For any substance in the mixture, mole fraction is equal to the ratio of number of moles of that substance in total moles of the mixture.
(b)
Interpretation:
The symbol
Concept introduction:
The partial pressure of pure solvent is defined as ratio of partial pressure of solvent in the presence of solute to the mole fraction of the solvent.
(c)
Interpretation:
The symbol
Concept introduction:
Freezing point is defined as the temperature showing equilibrium between solid and liquid solvent. At this point, the vapor pressure of both is same.
(d)
Interpretation:
The symbol
Concept introduction:
The Van’t Hoff factor is defined as a measure of solute’s effect on the colligative properties of the solution.
(e)
Interpretation:
The term activity needs to be explained.
Concept introduction:
In
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GENERAL CHEMISTRY-MOD.MASTERINGCHEM.
- The carbon dioxide exhaled in the breath of astronauts is often removed from the spacecraft by reaction with lithium hydroxide 2LiOH(s)+CO2(g)Li2CO3(s)+H2O(l) Estimate the grams of lithium hydroxide required per astronaut per day. Assume that each astronaut requires 2.50 103 kcal of energy per day. Further assume that this energy can be equated to the heat of combustion of a quantity of glucose, C6H12O6, to CO2(g) and H2O(l). From the amount of glucose required to give 2.50 103 kcal of heat, calculate the amount of CO2 produced and hence the amount of LiOH required. The H for glucose(s) is 1273 kJ/mol.arrow_forwardA rebreathing gas mask contains potassium superoxide, KO2, which reacts with moisture in the breath to give oxygen. 4KO2(s)+2H2O(l)4KOH(s)+3O2(g) Estimate the grams of potassium superoxide required to supply a persons oxygen needs for one hour. Assume a person requires 1.00 102 kcal of energy for this time period. Further assume that this energy can be equated to the heat of combustion of a quantity of glucose, C6H12O6, to CO2(g) and H2O(l). From the amount of glucose required to give 1.00 102 kcal of heat, calculate the amount of oxygen consumed and hence the amount of KO2 required. The ff0 for glucose(s) is 1273 kJ/mol.arrow_forwardA soft drink contains an unknown mass of citric acid, C3H5O(COOH)3. It requires 6.42 mL of 9.580 × 10−2-M NaOH to neutralize the citric acid in 10.0 mL of the soft drink. C3H5O(COOH)3(aq) + 3 NaOH(aq) → Na3C3H5O(COO)3(aq) + 3 H2O(ℓ) Determine which step in these calculations for the mass of citric acid in 1 mL soft drink is incorrect? Why? n (NaOH) = (6.42 mL)(1L/1000 mL)(9.580 × 10−2 mol/L) n (citric acid) = (6.15 × 10−4 mol NaOH) × (3 mol citric acid/1 mol NaOH) m (citric acid in sample) = (1.85 × 10−3 mol citric acid) × (192.12 g/mol citric acid) m (citric acid in 1 mL soft drink) = (0.354 g citric acid)/(10 mL soft drink) Determine the correct result.arrow_forward
- Assume that the radius of Earth is 6400 km, the crust is 50. km thick, the density of the crust is 3.5 g/cm3, and 25.7% of the crust is silicon by mass. Calculate the total mass of silicon in the crust of Earth.arrow_forwardA geochemist measures the concentration of salt dissolved in Lake Parsons and finds a concentration of 69.32 g.L The geochemist also measures the concentration of salt in several nearby non-isolated lakes, and finds an average concentration of 5.02 g⋅L¯¹. Assuming the salt concentration in Lake Parsons before it became isolated was equal to the average salt concentration in nearby non-isolated lakes, calculate the percentage of Lake Parsons which has evaporated since it became isolated. Be sure your answer has the correct number of significant digits.arrow_forwardA geochemist measures the concentration of sait dissolved in Lake Parsons and finds a concentration of 6.9 g-L. The geochemist also measures the concentration of salt in several nearby non-isolated lakes, and finds an average concentration of 2.7 gL. Assuming the salt concentration in Lake Parsons before it became isolated was equal to the average salt concentration in nearby non-isolated lakes, calculate the percentage of Lake Parsons which has evaporated since it became isolated. Round each of your answers to 2 significant digits.arrow_forward
- If 0.42 mg calcium fluoride, CaF2 is used as above to add fuoride to the drinking water, doesCaFz add more fluoride than 0.42 g of NaF in the 250 mL glass of water? Justify your answer.arrow_forwardA cake requires 3 eggs, 4 cups of flour, 2 cups of sugar, and 1 stick of butter. In the refrigerated pantry, a chef has the following available: · 46 sticks of butter • 62 eggs · 50 cups of flour · 37 cups of sugar Which is the "limiting reagent" (the limiting ingredient) that will run out fırst and how do you know? Justify your answer mathematically.arrow_forwardA student is preparing a solution of sucrose (C12H22O11) at a specific concentration. They are doing this by weighing out sucrose on a scale, placing it in a volumetric flask, dissolving it in water, and then diluting it up to the mark on the volumetric flask with water. How would the experimental (actual) molar concentration for C12H22O11 differ from the calculated concentration (higher, lower, or the same) given the following scenarios? Explain. (Hint: Compare the calculated concentrations to experimental concentrations). c) When preparing the diluted solution, a student used the pipet bulb to blow out the last few drops in the pipet into the solution.arrow_forward
- Insoluble Li2CO3 (s) precipitates when solutions of Na₂CO3(aq) and LiCl(aq) are mixed. Na2CO3(aq) + 2 LiCl(aq) → Li₂CO3 (s) + 2 NaCl(aq) A,HⓇ = ? To measure the enthalpy change, 100. mL of 0.65 M Na₂CO3(aq) and 100. mL of 1.3 M LiCl(aq) are mixed in a coffee-cup calorimeter. The temperature of the mixture rises by 1.3 °C. Calculate the enthalpy change for the precipitation of Li2 CO3(s) in kJ/mol. (Assume the density of the solution is 1.0 g/mL, and its specific heat capacity is 4.2 J/g. K.) kJ/mol Li₂CO3 A, H = =arrow_forwardPhenobarbital was introduced in 1912 for the treatment of epilepsy. It is an anti-convulsant and sedative-hypnotic drug and used to control seizures. The measurement of phenobarbital is by fluorescence method. A 5.00 mL aliquots of an unknown containing phenobarbital were delivered to 50.00 mL volumetric flasks. The following volumes of a standard solution of phenobarbital, 2.00ug/mL, were then introduced to the volumetric flasks before diluting to volume with the corresponding signals on a fluorometer equipment. Find the concentration of phenobarbital in the original unknown sample.arrow_forwardEarth’s oceans have an average depth of 3800 m, a total surface area of 3.63x108 km2, and an average concentration of dissolved gold of 5.8x10-9 g/L. (a) How many grams of gold are in the oceans? (b) How many cubic meters of gold are in the oceans? (c) Assuming the price of gold is $1595/troy oz, what is the value of gold in the oceans (1 troy oz 5 31.1 g; d of gold 5 19.3 g/cm3)?arrow_forward
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