4.2 The density of a sample of poly(ethylene terephthalate), PET, is measured to be 1.468 g/cm³. A. What fraction of this PET is amorphous? B. What is the density of a PET sample that is 45% crystalline? The density of amorphous PET has been reported to be 1.336 g/cm³ and crystalline PET as 1.514 g/cm³.

1.6 Properties: Diffusivity Estimate the molecular diameter and diffusion coefficient for the proteins ribonuclease (MW 13,700 Da), hemoglobin (MW 68,000), and urease (MW 480,000), assuming the molecules are spherical and the density of each protein molecule is 1.3 g/cm³.

An Al-4.5wt%Cu alloy has a low-temperature yield stress of 600 MPa due to the precipitation strengthening effect imparted by the equilibrium q phase (Al2Cu) precipitates. Estimate the interparticle spacing and particle size in this alloy. Given: density of α-solid solution 2,700 kg/m3 and density of q phase 4,430 kg/m3. Assume the Cu content in α-solid solution 0.5 wt% and the Cu content in the q phase 54%.   Hint: You need to use the Orowan model of particle strengthening and the lever rule among other concepts.

number 2 ONLY

The percent by mass of phenol (MM= 94.11 g/mol) in an aqueous solution is 10.9%. What is the molality of the phenol solution?

Using the following data, compare the effect of supersaturation ratio over the range of 1.005 to 1.02 on the primary homogeneous nucleation of AgNO3, NaNO3, and KNO3 from aqueous solutions at 25oC:

Classify each of the following substances as either a strong or weak acid, strong or weak base, or a soluble or insoluble salt. Clear All strong acid HCN weak acid KCIO, strong base NH3 weak base NaOH soluble salt HF insoluble salt

The standard molar enthalpy of formation of calcium carbonate (CaCO) is -1206.9 kJ/mol. What will be the enthalpy for the formation of 75 g of CaCO? (MM-100.1 g/mol) a.) -1206.9 kJ b.) -9043 kJ c.) 16.09 kJ d.) 603.4 kJ

Consider Polyethylene, the polymer made from ethylene. Calculate the molar mass of a Polyethylene molecule that contains 5 x 104 C2H4 units.

2. What would the coordination number and coordination geometry be for a crystalline ceramic with a cation-anion radius ratio of 0.285?