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Determine the number of ammonia molecules in 4.85g of ammonia (NA= 6.022 x 1023 mol-1).
Hydroxylamine hydrochloride is a powerful reducing agent which is used as a polymerization catalyst. It contains 5.80 mass % H, 20.16 mass % N, 23.02 mass % O, and 51.02 mass % Cl. What is its empirical formula?
A 100 g sample of an unknown liquid absorbs 2000 J of heat energy, raising the liquid's temperature from 50 ?C to 70 ?C .What is the speci?c heat capacity of this liquid.
2.4 g of a hydrocarbon fuel is burned in a calorimeter that contains 262 grams of water initially at 25.00 C. After the combustion, the temperature is 26.55 C.
explain why the vitamin tablet is crushed before titrating with the iodate titrant.
what tempreture must 0.040 moles of water vapor be heated in a 500ml flask before the pressure in the flask becomes 2 atm.
A pipette is used to add 32 mL of 0.2 M Pb(NO3)2 to a 261.0 mL solution of 0.3 M NaF. Determine the equilibrium concentration of Pb2+(aq) in the final solution. Ksp(PbF2)=3.6E-8.
a mass of 48.5 g of a certain substanse can be disolved in 29.1 cm3 of water at 20 degrees celcius. Calculate the solubility of this substance per gram of water at the same temperature.
Which thermodynamic factor is the most significant in accounting for the fact that phophoric acid is a weak acid? why? Please make sure it is answered completely and explained so I can learn how to do it.
Protons can be accelerated to speeds near that of light in particle accelerators. Estimate the wavelength (in nm) of such a proton moving at 2.90 X 108 m/s. (Mass of a proton=1.673 X 10-27 kg)
95.0mL of rm H_2O is initially at room temperature (22.0rm{} ^{circ}C). A chilled steel rod at 2.0rm ^{circ}C is placed in the water. If the final temperature of the system is 21.4^{circ}C.
When 56.0 g calcium and 34.7 g nitrogen gas undergo a reaction that has a 88.0% yield, what mass of calcium nitride forms?
Draw the structure of Caffeine. Skeletal form only. Locate 2 bonds in the molecule that are obviously polar covalent.
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