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When 0.935g of a fuel underwent complete combustion in excess of oxygen, the increase of temperature of water in a calorimeter containing 1.365g of water was 2.400 C. calculate the higher calorific value of the fuel, if the water equivalent of calorimeter, etc. is 135g.
The Ksp for solid C3D2 is 8.8 × 10-24. What is the solubility of C3D2 in water in units of moles per liter?
I have given some data where mass of can =41.5 g ,Mass of water=220.0g, initial temp water = 29.3C, final temp water & Al=33.9C, Mass can,water,Al=276.1, initial temp Al= 21.1 .. Calculate heat gained by water & can. Where specific heat of can 0.920J/gC. & Specific heat of water= 4.184J/gC . formula given is Qw= MwCw(Tf-Ti) , QC=McCc(Tf-Ti) ..Question: 2 find total heat of water & can absorbed by metal ingot ; Qtot= Qw+QC.. Question: 3 find specific heat capacity of metal ingot. Here as energy released from metal ingot so Qtotal will be negative ; -Qtot,= MmCm(Tf-Ti).. This last question is difficult for me
If I asked you to make 20 ml of .2 M NaOH. How many grams of NaOH would you need to measure out?
Planning and design
You are required to conduct an experiment that should be buffered at pH = 5.2. The only chemicals available are butanoic acid and sodium butanoate. Plan and design an experiment to demonstrate how you would prepare 100 ml of this buffer using 10 ml of 0.05 M butanoic acid. Show all calculations.
A mixture of gases at a pressure 7.50 x 104 Nm-2 has the volume composition 40% N2; 35% O2; 25% CO2. (a) What is the partial pressure of each gas?
(b) Deduce the partial pressure of the nitrogen and oxygen if the carbon dioxide is removed by the introduction of some sodium hydroxide pellets?
Chlorine occurs as a mixture of two isotopes, 35Cl and 37Cl. What is the ratio of the diffusion rates of the three species (35Cl)2, 35Cl37Cl, and (37Cl)2?
(b) The lunar surface reaches 370 K by midday. The atmosphere consists of neon, argon and traces of helium at a total pressure of only 2 x 10-14 atm. Calculate the root mean square speed of each component in the lunar atmosphere.
How old is a sample of wood whose 14C content is found to be 43% that of a living tree? The half-life of 14C is 5730 years.
(b) Iodine-131 is one of the most important isotopes used in the diagnosis of thyroid cancer. One atom has a mass of 130.906114 amu. Calculate the binding energy per nucleon.
. Estimate the solubility of MgCO3 in g/l if its KS=4.0·10-5 M2
The lunar surface reaches 370 K by midday. The atmosphere consists of neon, argon and traces of helium at a total pressure of only 2 x 10-14 atm. Calculate the root mean square speed of each component in the lunar atmosphere
