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Explain what mass (g) of potassium chloride is contained in 430 ml of a potassium chloride solution that has a chloride ion concentration of 0.193 M?
suppose a 5.00 L sample of diatomic oxygen at a given temperature and preesure contains 1.08x10^23 molecules. How many molecules would be contained in 5.00L of hydrogen?
Calculate the pH of a solution that is .15 M Na2HPO4(aq) and .44 M Na3PO4(aq). Not sure how to solve it. The ka1 of H3PO4 is 7.6 x 10^-3, pKa1 is 2.12, ka2 is 6.2 x 10^-8, pka2 is 7.21, ka3 is 2.1 x 10^-13, pka3 is 12.68.
A sample of pure oxalic acid hydrate was obtained by extracting a plant called Snake Tongue. A 3.000 g sample of the materials heated carefully in a vacuum oven until no more mass was lost from the sample.
Explain what happens to the heat produced by an exothermic reaction conducted in an adiabatic calorimeter
An aqueous potassium nitrate solution has a freezing point of -2.0 °C. How many moles of potassium nitrate are contained in 0.5 kg of water in this solution? The freezing point depression constant for water is -1.86 °C/m.
Pinacol (2,3-dimethyl 2,3-butanediol) gives a mixture of pinacolone (3,3-dimethyl-2-butanone) and 2,3-dimethyl 1,3-butadiene by treating with acid.
Draw the organic product of the following reaction between (1S,3S)-1-chloro-3-methylcyclopentane and methanethiol in the presence of sodium hydroxide.
4.5 L of Mg(OH)2 solution was titrated with 5.03 mL of 0.200 M HCl. Calculate the the molarity of Mg(OH)2 solution and the ksp.
Consider a solution formed by mixing 60.0 mL of 0.100 M H2SO4, 30.0 mL 0.100M HOCl, 25.0 mL 0.180M NaOH and 25.0 mL 0.100 M Ba(OH)2. Calculate the pH of this solution.
Glucose is pumped into some animal cells by a symporter powered by simultaneous entry of Na+. The entry of Na+ provides a free-energy input of 10.8 kJ/mol under typical cellular conditions (external [Na+] = 143 mM, internal [Na+] =14 mM
What is the osmotic pressure, in atm, of a solution formed by dissolving 17.8 g of PbCl4 in 0.250 L of water at 64.4 oC? (R = 0.0821 L-atm/mol-K; 0 oC = 273 K)
A cook wants to heat 1.75 of water from 26.0 to 100.0 If he uses the combustion of natural gas (which is exothermic) to heat the water, how much natural gas will he need to burn? Natural gas produces 49.3 of heat per gram.
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