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A certain first-order reaction () has a rate constant of 6.60×10-3 at 45 . How many minutes does it take for the concentration of the reactant, , to drop to 6.25 of the original concentration?
Calculate the pH of a buffer solution prepared by dissolving 23.4 g benzoic acid (HC7H5O2) and 35.0 g sodium benzoate in 215.0 mL of solution.
How many moles of methane (CH4) are required to react completely with 139 L of carbon tetrachloride according to the following reaction at 0 C and 1 atm
Calculate the amount of heat needed to convert 96 g of ice at -24C to water at 28C. The specific heat capacity of H2O(s) is 2.1J/g*C.
Consider the following species with tetrahedral electron-pair geometries and select the species with the smallest predicted bond angles.
find the time required for the total pressure in the system containing N2O5 at an initial pressure of 0.1 atmospheres to raise to 0.145 atmosphere
What is the molecular equation, total ionic equation, and net ionic equation for the reaction of Pb(NO3)2 and HCl
A gas sample was collected over water at 25.3 0C. The total pressure is determined to be 0.97 atm. What is the partial pressure of the gas that was collected?
How many electrons could occupy a subshell with the following quantum numbers? A) n=5, l=4, B) n=2, l=0, ml=0
When 0.0500 mol of HCl is reacted with 0.0500 mol of NaOH in 50.0 mL of water, the temperature of the water increases by 13.7°C. Calculate the heat of the reaction for the following thermochemical equation
In the preparation of esters, the reaction product was extracted with 5% of sodium bicarbonate solution in the isolation step. Why? What gas was evolved during this washing step? Write a balanced equation for the reaction that produced it.
Ethyl chloride vapor decomposes by the first-order reaction C2H5Cl --> C2H4 + HCl The activation energy is 249 kJ/mol and the frequency factor is 1.6 X 10^14 s^-1 The rate constant at 730 K is 2.4 x 10^-4 s^-1. 1)
Balance the following skeleton reaction, calculate Ecell, and state whether the reaction is spontaneous:
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