Physical Chemistry Answers

The reaction of benzyl alcohol (10.81 g, 0.10 mol , FW 108.1 g/mol) with p-toluenesulfonyl chloride (21.9 g, 0.114 mol , FW = 190.65) in toluene (500 g) and triethylamine (15 g, FW = 101) produces the ester benzyl p-methylbenzenesulfonate (FW = 262.29), isolated in 90% yield (0.09 mol, 23.6 g) and hydrochloric acid (3.28 g, FW 36.45). Calculate the mass efficiency.

Several physicochemical parameters vary with temperature. For example, at 100°C the pH of pure water is approximately 6. Under these conditions. Calculate the concentration of OH- in micromolar.

Poly(methyl methacrylate) is used in the manufacture of resins and plastics. The green synthesis is shown below. Determine the atom economy for the process.

The chemical X has an LD5o of 80 mg/kg. The lethal dose is expressed as the milligrams of X (80 mg) per kilogram of body weight of the test animal (typically rats ). This dose tell s us that 50% of the rats will die if they are given 80 mg of X per kg body weight of the subject animal. Thus, for a person who weighs 100 kg there is a 50% chance that a dose of (80 mg) x (70 kg) = 5600 mg or 5.6 g may be fatal. What is the volume of X (in microlitres) for the fatal dose (LDso) of X that will kill a person who weighs 70 kg? (Density of X = 1.446 g/mL).

A 50.00 mL water sample is titrated to the phenolphthalein end-point with 5.00 mL of 0.02 N H2S0 4 , and to the methyl orange end-point with additional 5.00 mL of the acid. What is the total alkalinity, in mgCaC03 /L?

Differentiate between integral enthalpy of so;ution and differential enthalpy of solution.

In which of the following compounds does ionic bonding predominate?(a)NH4Cl(b)CO2(c)CH4(d)

LiBr

How many atoms are in 185 grams of Ni

Si se agrega bicarbonato de sodio adicional a la reacción presentada a continuación

2NaHCO3(s) ➜ Na2CO3(s) + H2O(g) + CO2(g)

¿qué sucederá con la reacción general?

Propane (C3H8) is a fuel commonly burned for needs such as home heating and cooking food. When propane burns, it reacts with oxygen (O2). The products of the reaction are carbon dioxide (CO2) and water (H2O). If 44.1 g of propane react completely with 160.0 g of oxygen, 132.0 g of carbon dioxide are formed. What is the mass of the other product, water, formed in this reaction?