Chapter 1, Problem 4P

The vapor pressure of Substance X is measured at several temperatures: temperature vapor pressure -47. °C 0.0484 atm -35. °C 0.131 atm -23. °C 0.322 atm Use this information to calculate the enthalpy of vaporization of X. Round your answer to 2 significant digits. Be sure your answer contains a correct unit symbol. x10

Manufacturers of headache remedies routinely claim that their own brands are more potent pain relievers than the competing brands. Their way of making the comparison is to compare the number of molecules in the standard dosage. Tylenol uses 325 mg of acetaminophen (C8H9NO2) as the standard dose, while Advil uses 2.00 x 102 mg of ibuprofen (C13H1802). Find the number of molecules of pain reliever in the standard doses of (a) Tylenol and (b) Advil. (a) Number Units (b) Number Units

A beaker of water of releases 1829.8 J of heat while cooling 39.0°C. What is the mass of the sample? Round to the nearest whole number. Chp & % 23 4. 5 6 7 3. y e k b m

In 12.0 g of carbon, there are NA = 6.02 x 10^23 carbon atoms (Avogadro’s number). If you could count 1 atom per second, how long would it take to count the atoms in 1.00 g of carbon? Express your answer in years.

The molecular formula of aspartame, the artificial sweetener marketed as NutraSweet Ⓡ, is C14H18 N2O5. How many moles of aspartame are present in 4.50 mg of aspartame? Express your answer using three significant figures. | ΑΣΦ n= ? mol

After performing an experiment on latent heat of fusion of ice, a group of students obtained an experimetal value of 78 cal/g.°C. What percent error did the group obtain after comparing the experimental value with the accepted value of latent heat of fusion of ice? O 0.082% O 8.2% O 0.25% O 2.5%

A 5.50 L sample of neon at 6.67 atm is added to a 10.0 L cylinder that contains argon. If the pressure in the cylinder is 7.63 atm after the neon is added, what was the original pressure (in atm) of argon in the cylinder? Hint is given in the feedback. Answer: 6.3315 Hint, what pressure would the neon have in the second container if no argon were present?

In an experiment to measure the specific heat capacity of Aluminum three values, 0.25 Cal/gm.Co, 0.20 Cal/gm.Co, 0.19 Cal/gm.Co, are determined, the percent error of their mean is: (Given that the accepted value of is 0.22 Cal/gm.Co) a. 4.5% b. 3.0 % c. 5.5% d. 7.2%

The specific reaction rate constant k is a strong function of temperature according to the following equation: 1 In the equation above, the reaction rate constant k is expressed in R is the universal gas constant 8.314- What is the unit of A? O mol m OK Om O J O mol K J mol 01 S Pa.m ³ m k=Axexp- Pa.m³ constant (1.314 P-²). mol. K E RT and T is the absolute temperature in K. The equation is dimensionally homogenous.