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Combustion of a 5.50 g sample of a compound containing only C and H produces 18.59 g of CO2 and 3.81 g of H2O. In another experiment, the molar mass of the compund was found to be 78g/mol. Determine the Empirical and molecular formulas for this compund.
write the balance the eguation fot the neutralization reaction between H2 SO4 KCH
The concentration of Mg2+ in seawater is 0.052 M. At what pH will 72% of the Mg2 be precipitated as the hydroxide salt? [Ksp for Mg(OH)2 = 8.9 multiplied by 10-12.]
Find the concentration and pH solution - What is the pH of a solution of 0.65 M acid and 0.51 M of its conjugate base if the pKa = 5.30?
An injection containing 10.0pg 10 5 B was injected into a patient suffering from a brain tumor. The patient was irradiated by a neutron gun at the site of the tumor.
In the neutralization reaction: HCl (aq) + NaOH (aq) = NaCl (aq) +H20, 25.0 mL of 0.212 M NaOH is neutralized by 13.6 mL of an HCl solution. The molarity of the HCl solution is ?
electrons having this speed would need to be treated as waves in atoms because the wavelength is on the order of the size of atoms.
The temperature of a 35.2 g sample of iron increases from 23.7 C to 29.5 C. If the specific heat of iron is 0.450 J/g-K, how many joules of heat are absorbed.
What is the vapor pressure (in torr) above a solution prepared by mixing 47.89 g of water, H2O, with 47.65 g of ethanol, C2H5OH, at 63.50 °C?
Water supply in a city is fluoridated by adding NaF. The preferred concentration of F- is 1.6ppm.calculate the amount of Naf in milligrams should be added per gallon (treated water) if the water supply is 0.2 ppm in F-?
Determine the amount of heat energy is needed to raise the temperature of 0.362 kilograms of Cu from 23. Degree Celsius to 60 degree Celsius?
When a 2.41x102 g strip of zinc is dropped into a large beaker containing excess hydrochloric acid, how many grams of gas are formed.
A zero-order reaction has a constant rate of 2.40×10-4 M/rm s. If after 80.0 seconds the concentration has dropped to 7.00×10-2 M,
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