chemlab 13 comparing rates of evaporation answers

CHEMLAB 13 COMPARING RATES OF EVAPORATION ANSWERS PLUS

What is the standard enthalpy of reaction, in kJ? Report your answer to three digits after the decimal. 970.494 Standard heats of formation for reactants and products in the reaction below are provided. Report your answer to three digits after the decimal. What is the molar heat of solution for the salt, in kJ/mol?

CHEMLAB 13 COMPARING RATES OF EVAPORATION ANSWERS PLUS

Assume the specific heat capacity of the solution is equal to that of pure water, and that the mass of the solution is equal to the mass of the solid plus the mass of water in the calorimeter. The final temperature of the solution is 52.591 C.Īssume no heat loss to the surroundings. The salt has a molar mass of 488.496 g/mol. 0.455 A coffee cup calorimeter is prepared, containing 100.000 g of water (specific heat capacity = 4.184 J/g K) at initial temperature 80.000 C. Report your response to 3 digits after the decimal. Assuming water has a specific heat capacity of 4.184 J/g ☌, what is the specific heat capacity of the metal sample, in J/g ☌)? Assume no heat loss to the surroundings. The final temperature of the water is 92.01 ☌. ans 41.8 A 312 g sample of a metal is heated to 344.401 ☌ and plunged into 200 g of water at a temperature of 49.171 ☌. If the molar mass of the metal is 53.13 g/mol, and you measure that the reaction absorbed 167 J of heat, what is the enthalpy of this reaction in kJ per mole of limiting reactant?Įnter your answer numerically to three significant figures in units of kJ/mol. You weigh out a 0.212 gram piece of metal and combine it with 68.7 mL of 1.00 M HCl in a coffee-cup calorimeter. 21.2 Suppose you are investigating the reaction: M(s) + 2 HCl(aq) → MCl2(aq) + H2(g). ans 0.0106 If 5.28 moles of gas are produced in an experiment and it is measured that they occupy 112 L at STP, what is the experimental molar volume of the gas?Įnter your answer numerically in units of L/mol. ans 41.8 If 0.257 g of Mg are reacted with 10.0 mL of 3 M HCl, how many moles of H2 should be produced theoretically?Įnter your answer numerically in units of moles. ans 0.9 A student measures the pressure, volume, and temperature of a gas in the laboratory and records the following data:īased on this information, what would be the volume of the gas at STP?Įnter your answer to three significant figures in units of mL. If the student measures that the total pressure inside the graduated cylinder is 0.931 atm and the experiment was performed at 25C, what is the pressure of hydrogen gas?Įnter your answer numerically in units of atm. ans 732.4 A student collects hydrogen gas over water in a graduated cylinder. If the atmospheric pressure is 742 mmHg and the level of water in the graduated cylinder is 13.1 cm higher than the level of the water exposed to the atmosphere, what is the total pressure of gases inside the graduated cylinder?Įnter your answer numerically in units of mmHg. The answer is where the line passes A student performs an experiment where gas is collected over water in an upside down graduated cylinder. At what approximate added volume of titrant does the equivalence point occur? Enter your answer numerically in units of mL. then use find the x and y intercept to find the second value (y intercept) Examine the second derivative plot shown below. Enter each of your answers as whole numbers without any rounding. ans 1.381 What is the equation of a line, in slope-intercept form, that connects the following two data points?Įnter your answer by filling in the following blanks.

What is the concentration of the Fe2+ solution? Report your response to three digits after the decimal. The equivalence point is reached after 16.247 mL of Ce4+ solution is added The solution is titrated with 0.878 M Ce4+ solution analyte is citric acid A titration is performed as follows:ġ0.338 mL of Fe2+ solution of unknown concentration is charged into a 100 mL beaker What is the analyte in this titration? answers: titrant is sodium hydroxide.

Phenolphthalein changes color from colorless to pink between pH of 7 - 9. A few drops of phenolphthalein is added to visualize the pH change. A solution of citric acid of unknown concentration, prepared in deionized water, is titrated with standardized sodium hydroxide solution, also in deionized water. ans 6.6Īnswer will be wherever the graph suddenly spikes. At what approximate added volume of titrant does the equivalence point occur? Enter your answer numerically.

Chemlab 13 comparing rates of evaporation answers