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What is the concentration of OH- in a solution that contains 0.225g of NaOH in 0.250L of solution?
The oxide of 'N' element contains 33.33% of the element .The same element forms a chloride whose Vapour density is 59.25.
A balloon 15m in diameter is inflated with helium at 20 degrees Celsius. How much work is done during inflation against an external pressure 1atm.
Typical rate of deposit of dust (dustfall) from unpolluted air was reported as 10 tons per square mile per month. Express this dustfall in milligrams per square meter per hour.
The vapor pressure of pure methanol, CH3OH, at 30 C is 160. torr. How many grams of the nonvolatile solute glycerol, C3H5(OH)3, must be added to 131. g of methanol to obtain a solution with a vapor pressure of 133. torr.
determine the heat released when (ethene) CH2 CH2 reacts with hydrogen gas and form CH3CH3.If Bond enthalpies given are H H : 436 kJ/mol,C Br : 276 kJ/mol,C C : 612 kJ/mol,C C : 348 kJ/mol,C H : 412 kJ/mol;
A 2.914-g sample gypsum, a hydrated salt of calcium sulfate, CaSO4, is heated at a temperature greater than 170 C in a crucible until a constant mass is reached.
Using a sample of gas has a mass of 38.7mg. Calculate the molar mass if its volume is 228mL at a temperature of 57°C and a pressure of 832torr?
When a metal was exposed to light at a frequency of 4.54× 10^15 s-1, electrons were emitted with a kinetic energy of 3.10 × 10^-19 J.
What is the amount of energy packaged in a photon with a wavelength of 310 nm. Calculate the frequency of EM radiation with a wavelength of 1.2 x 10-7 m
You have successfully purified a protein to homogeneity. From gel permeation chromatography studies, you determine that the protein has a molecular weight for 235,000 daltons.
how many grams of potassium bromide are required to prepare 350 mL of a .200 M solution.
What volume of a 0.50 M KOH solution is needed to neutralize completely 10.00 mL of a 0.30 M H2SO4 solution? The neutralization reaction is 2KOH + H2SO4 → K2SO4 + 2H2O.
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