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A 0.2527-g sample of a mixture of Mg(OH)2 and Al(OH)3 was treated with 50.00 mL of 0.225 mol L?1 HCl(aq). The resulting solution required 13.73 mL of 0.176 mol L?1 NaOH(aq) to neutralize the excess, unreacted HCl. What was the percentage by mass of Mg(OH)2 in the original sample? [Hint: When Mg(OH)2 or Al(OH)3 reacts with HCl(aq), the products are a chloride salt, water and CO2(g). Assume that all of the CO2(g) leaves the solution without reacting.]
The precipitate was filtered, dried, and weighed. A total of 2.10 g calcium fluoride was collected. What was the percentage of CsF in the original sample?
(The molecular formula for X is C8H8O2), and (The empirical formula for X is C4H4O) are all true. C) The empirical formula for X is C4H4O. D) The molecular formula for X is C8H8O2. E) X has a molecular mass of 136.
What proportions of ethanol and water should be mixed in order to produce 100 cm3 of a mixture containing 50 percent by mass of ethanol.
Provide a method for seperating the mixtures of the compounds, dissolved in a solvent diethyl ether. In each case one of the components will be neutral compound. Give your answer in the form of flow chart.
Polychlorinated biphenyls (PCBs), which were formerly used in the manufacture of electrical transformers, are environmental and health hazards. They break down very slowly in the environment. The decomposition of PCBs can be represented by the equ..
A sample of N2O3 contains 1.26 moles of nitrogen. Use the following atomic masses: N =14, O=16.
A buffer solution is .200 M in HNO2 and .185 M in NaNO2. What is the pH of the buffer system after 50 ml of .100 HCl is added to 250 ml of the buffer solution?? Ka of HNO2 = 4.6*10^4. (please show all work)
What volume (in mL) of 0.583 M solution of sodium chloride can be made from 48.3 mL of a 1.88 M solution? Assume the volumes are additive
a gas mixture consists of N2, O2, and Ne where the mole fraction of N2 is .55 and the mole fraction of Ne is .25. If the mixture is at STP in a 5.0 L container, how many molecules of O2 are present.
Calculating Kc, Given the amount of reactant in grams in a container at a temperature and amount produced in moles, calculate Kc:
What is the rate of consumption of O2 in a combustion reaction carried out in a 11.00 L flask if 6.30 mmol of oxygen is consumed in 25.6 s?
Granite rock has a specific heat capacity of 0.80 J·°C-1·g-1. A 15 g rock was warmed by 202 J of energy from sunlight. What was the increase in temperature of the rock (in °C)?
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