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When 5.00 g of sodium hydroxide (NaOH) was dissolved in 150.00 g of water a value of 10.50oC was obtained for ΔT.
For a radioactive decay (decomposition of a radioactive substance) the half-life is 6.0 h. How much radioactive substance remains after 22 h, in % (radioactive decay is a first-order process)
Calculate the molarity of a solution made by dissolving 0.650 grams of Na2SO4 in enough water to form exactly 880 mL of solution.
If the partial pressure of a gas produced in a reaction was determined to be 0.35 atm in a 161.0 mL container and at a temperature of 25.0°C, how many moles of gas were produced? (Hint: Use the ideal gas law and convert temperature to Kelvin, volu..
Iodine gas and bromine gas combine to form iodine monobromide according to the following equation with an equilibrium constant of 1.2 x 102 at 150 0C. I2 (g) + Br2 (g) 2IBr (g)
Find the total number of atoms in a sample of cocaine hydrochloride, C17H22ClNO4 of mass 20.0 mg.
Geologist can estimate the age of rocks by their uranium-238 content. The uranium is incorporated in the rock as it hardens and then decays with first-order kinetics and a half-life
Suppose that a student performed the experiment and the calculations perfectly except for the following. Unknown the student, Cu (NO3)2•3H2O instead of CuSO4•5H2O was used to make up the known Cu 2 solution
A brand of lunchmeat contains 0.11% by mass of a preservative, sodium benzoate, C6H5COONa. Health Canada recommends a an upper level intake of Na to be 2300 mg
In photography, solutions of sodium thiosulfate are used to dissolve unexposed AgBr (Ksp = 5.0 × 10-13) in the developing process for black-and-white film. What mass of AgBr can dissolve in 1.00 L of 0.238 M Na2S2O3.
A 1.5991 g sample of a hydrocarbon is combusted to give 1.6918 g of H2O and 5.1661 g of CO2. What is the empirical formula of the compound
A mixture of N2, O2, and CO2 has a total pressure of 791. torr. In this mixture the partial pressure of N2 is 115. torr and the partial pressure of O2 is 193. torr.
The total molarity of acid and conjugate base in this buffer is .100 M. A student adds 7.10 mL of a .250 M HCl solution to the beaker. How much will the pH change? The pKa of acetic acid is 4.760
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