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The mass spectrum of a hypothetical element shows that 86.19% of the atoms have a mass of 27.977 u, 0.825% have a mass of 28.976 u, and the remaining have a mass of 29.974 u. Calculate the average atomic mass of this element (in units of u).
Calculate the minimum mass of Pu-238 (in kilograms) that would had to have been loaded on the spacecraft at the time of its launch from earth.
tim and a friend left a campsite on a trip down a river in a canoe maintaining a constant speed of 4 miles per hour.
The saturated vapor pressure of mercury is 0.0020 mmHg at 300 K and the density of air at 300 K is 1,18 g L^-1. (a) Calculate the concentration of mercury vapor in air in mil L^-1. (b) What is the number of parts per million (ppm) by mass of mercu..
write a balance equation for the formation of C4H10O(i) from its elements (c) By using the information in this problem and data in Table 5.3, calculate ?H°f for diethyl ether
Nitrogen monofluoride, NF, can serve as a ligand in transition-metal complexes. a. Prepare a molecule orbital energy-level diagram of the NF molecule, showing clearly how the atomic orbitals interact.
Define dipole moment. Distinguish between polar and nonpolar bonds.Give an example of each
Calculate the [H+] and pH of a solution made by mixing 30.00mL of 0.238 M CH3COOH with 30.00mL of 0.250 M CH3COONa. (Ka for acetic acid = 1.8x10^-5)
a solution of a and b with 30 mole percent of a is in equilibrium with its vapour which contains60 mole percent of a.
explain what a compound is, and give the names and formulas for 10 compounds containing your your chosen element. When 41.8 mL of 0.4731 M strontium hydroxide reacts with 26.1 mL of 0.2596 M cobalt(III) sulfate, two precipitates can form. Assume vo..
You mix 50 ml of a weak monoprotic acid with 50 ml of NaOH solution in a coffee cup calorimeter. Both solutions and the calorimeter were initially at 22 C.
CaO can be used as a drying agent. One such application occurs when water is added to dry concrete or cement. The reaction that occurs is Substance CaO(s) + H2O(l) = Ca(OH)2(s)
suppose the actual yield is 7.52 of CH3OH. what is the % yield?
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