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Brand B antacid sells 100 tablets in a bottle for $3.99. A student found that a brand B tablet would neutralize 0.011 moles of HCl per tablet. Which is the better buy, brand A or brand B? Why?
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What is the mass of NaOH present in grams, given that a 100. mL solution has a concentration of 0.125 M?
Why do the instructions call for using a saturated solution of NaOH rather than one at lower concentration? Why can we ignored in the calculation of the concentration of NaOH?
Determine the molecular formula of a compound that contains 26.7% P, 12.1% N, and 61.2% Cl, and has a molar mass of 580.0 g/mol. Enter chemical formula as is HC2H3O2 as HC2H3O2.
What was the initial energy level of an electron if it was excited by a photon of wavelength 38.9µm and jumped to an energy level of 10?
How many formula units of Na2SO4are present in a 450 gram sample of the salt? Use 6.022×1023mol-1 or Avogadro's number. Report your answer in scientific notation. Your answer should have two significant figures.
An aqueous solution has a normal boiling point of 102.0°C. What is the freezing point of this solution? For water K b is 0.51°C/ m and K f = 1.86°C/ m.
Describe how to assign a Oxidation number from the text: The oxidation number of an atom in an elemental substance is zero. The oxidation number of a monatomic ion is equal to the ion's charge. Oxidation numbers for comm ...
A compound contains only carbon, hydrogen, and oxygen. Combustion of 10.68 mg of the compound yields 15.48 mg CO2 and 7.39 mg H2O. The molar mass of the compound is 182.2 g/mol. What are the empirical and molecular formu ...
Does dissolved solids such as sugar and salt modify/change the boiling point of water; do mixtures have the same boiling point as pure substances?
The molecular weight of an unknown gas was measured by an effusion experiment. It was found that it took 64 seconds for the gas to effuse, whereas nitrogen required 48 seconds. The molecular mass of the gas is ?
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Describe the difference between zero coupon bonds and coupon bonds. Under what conditions will a coupon bond sell at a p
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