Physical Chemistry Answers

Give a short account of colloidal state of matter with special reference to 5

classification, properties of colloids and preparation of colloids.

At which wavelength (as nanometer) would it take 0.80 moles of photons to break a covelant bond with a bond dissociation energy of 347.8 kJ mol^-1?

An antacid tablet contains sodium hydrogen carbonate and inert ingredients. A 0.50g sample of the powdered tablet was mixed with 50cm3 of 0.19MHCl. The mixture was allowed to stand until it reacted

NaHCO3(s) + HCl(aq)  NaCl(aq) + CO2(g) + H2O(l)

The excess hydrochloric acid was reacted with 47.1cm3 of 0.128molddm-3 NaOH. What is the

percentage of NaHCO3 in the antacid?

Practice Exercise 4.6

Pure aluminum (Al) metal reacts with hydrochloric acid (HCI) to produce aluminum chloride (AlCl3) and hydrogen (H2) gas.

a. Write the balanced chemical equation for the reaction described above.

b. If the expected mass of AlCl3 to be formed is 3.5 g, what should be the initial mass of the pure aluminum metal?

c. If the actual mass of AlCl3 produced is 3.1 g, what is the percentage yield of the reaction?

if dinesty is 12g/ml and mass is 10 g what will be its volume

In an atom the last electron has a 3d² electron configuration.then what is the electron configuration of the element using a noble gas as a core?

What is the OH concentration of a 0.08M solution of CH3COONa. [Ka(CH3COOH)=1.8×10^5)

Water is to be heated from its pipeline temperature of 20°C to 90°C using superheated steam at 450°C and 2.5 MPa in a steady state process to produce 10 kg/s of heated water. In each of the processes below, assume there is ho heat loss.

a) The heating is to be done in a mixing tank by direct injection of the steam, all of which condenses. Determine the two inlet mass flows needed to meet the desired hot water flow rate.

b) Instead of direct mixing, a heat exchanger will be used in which the water to be heated will flow inside copper tubes and the steam will partially condense on the outside of the tubes.. In this case heat will flow from the steam to the water but the two streams will not be mixed. Calculate the steam flow rate if the steam leaves the heat exchanger at 50 percent quality at 100°C

a substance was exposed to radiation of wavelength 4.2x10^-6 m^-1 ;if the frequency difference between the first stokes line and the first anti stokes line is 7.6x10^4 m^-1, calculate the frequencies of two lines.

What would the rate constant of the reaction be given the following set of

experiments?

A + B → C + D

Experiment [A] (M) [B] (M) Initial Rate (M/s)

1 0.040 0.040 2.2x10-4

2 0.040 0.080 4.4x10-4

3 0.080 0.080 8.8 x 10

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