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An unknown element has two naturally occurring isotopes. Isotope 1 has a mass of 107.0 amu and an abundance of 55.9%. Isotope 2 has a mass of 109.0 amu. What is the atomic mass of the element?
Calculate the concentration of sulfide in the sample? A similar 10.0-mL sample plus 1.00 mL of 0.030 M sulfide diluted to 25.0-mL give a reading of -224.0 mV
What is the kinetic energy of this soccer baal? Mass of soccer ball is= 0.38 kg and fits this description out of these four given cations ?
An experiment shows that a 247 mL gas sample has a mass of 0.432 g at a pressure of 747 mmHg and a temperature of 28 degrees celcius.What is the molar mass of the gas?
A mixture consisting of 50 grams of ethanol and 50 grams of water is distilled using an efficient column. How much water will remain in the distillation flask the instant all of the azeotrope
How many grams of chlorine gas must be reacted with excess sodium iodide if 20.0 moles of sodium chloride are needed?
Calculate the mass of silver nitrate (in grams) in a 145 mL solution of 5.38 M AgNO3.
another part says spectra of caffeine, benzoic acid, and a mountain dew sample in 0.10 M HCl. On a graph it has the points 8.74 mg/L for benzoic acid, 1.5 dilution for mountain dew soda,
What is the heat of reaction (kJ) per mole of acid? Assume the mixture has a specific heat capacity of 4.18 J/(g·K) and that the densities of the reactant solutions are both 1.00 g/mL.
Rutherford fired positively charged particles at metal foil and concluded that most of the mass of an atom was..a) in the electrons.
Calculate the pH of a buffer solution that contains 0.25 M benzoic acid (C6H5COOH) and 0.15 M sodium benzoate (C6H5COONa). Ka= 6.5 x 10^-5 for benzoic acid. Please show your work for how you got this.
calculate delta s values for following reactions. in each case, account for the sign of delta s. a) C2H4(g) + H2(g) ---> C2H6(g)
best describes the self-sustaining process of fission with a critical mass of uranium-238?
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