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a) At 25oC , water rises 7.36cm in a capillary of radius 0.2mm. Calculate the surface tension of water at 25 oC in mN/m and mJ/m2
b) The contact angle between water and a carbon nanotube (CNT) bundle is 86.3o (J. Phys. Chem. B, 2006, 110, 15945). If the surface tension of CNTs is ~28mN/m, calculate the interfacial tension between water and CNTs.
c) A 100g of bulk water is dispersed as droplets of radius 0.5x10-5 mm. How much work (in kJ) is required to do this?
d) Approximate the number of water molecules in a droplet of water of radius 0.5x10-5 mm
calculate the ph of the buffer system make up of 0.15m 0.35m nh4cl. will you explain how to solve this. step by
The volume of 0.100 mol of helium gas at 27 degree Celsius is increased isothermally from 2.00 L to 5.00 L. Assuming the gas to be ideal, calculate the entropy change for the process.
What is the maximum number of grams of NH4SCN (s) that can be prepared from 9.00 g of CS2 (L) and 3.00 g of NH3 (g). The reaction is CS2 (l) + 2 NH3 --> NH4SCN (s) + H2S (g)
is it possible to use methylene blue to determine the concentration of ascorbic acid in orange
Automobile antifreeze is made by mixing equal volumes of ethylene glycol (d=1.114 g/mL, MW= 62.07 g/mol) and water (d=1.00 g/L, MW= 18.02 g/mol). Assume that the volume are additivr, calculate concentrationin the following units:
Explain which of the following substance has the lowest melting point
What mass of NaOH is needed to precipitate the Cd^{2+} ions from 32.0 mL of 0.480 M Cd(NO3)2 solution?
a patient needs to take 625 of ibuprofen twice daily. the pills in the bottle are each 250. . how many pills does the
Rubidium has two naturally occurring isotopes with the following masses and natural abundances, Calculate the atomic weight of rubidium.
Trichloroacetic acid (CCl3CO2H) is a corrosive acid that is used to precipitate proteins. The pH of a 0.050 M solution of trichloroacetic acid is the same as the pH
What is the molar solubility of silver bromide in a solution that also contains 0.050M Ag+ ions at 25 °C? The Ksp of AgBr is 5.4 × 10-13.
Three gases, nitrogen, helium, and krypton are confined in a 9.00 L vessel at a pressure of 7.00 atm. The vessel contains 5.00 moles of nitrogen, 2.00 moles of helium, and 2.00 moles of krypton. What is the partial pressure of helium
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