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A reaction is first order overall. For a given sample, its initial rate is 0.0200 mol L-1 s-1 and 25.0 days later its rate dropped to 6.25 x 10-4 mol L-1 s-1. What is its half-life?
The Ksp of Ca(OH)2 is 5.5x10^-5. What is the concentration of the OH^- (aq) when in a saturated solution of Ca(OH)2 (aq)
A beaker contains a 25% by mass solution of aqueous propylene glycol. If a chemist gently heats the beaker in order to evaporate all the water away without evaporating any of the propylene glycol, all of the pure propylene glycol should remain in ..
1) The nonvolatile, nonelectrolyte estrogen (estradiol), C18H24O2 (272.4 g/mol), is soluble in ethanol, CH3CH2OH.
Problem- A student accidentally extracted the original solution with NaOH (aq) and the NaHCO3 (aq). When he acidified the NaHCO3 extract, no crystals formed.
Gasoline is composed of hydrocarbons. Which additive, ethanol or MTBE, is more compatible (similar) with gasoline? Why? Gas manufactures definitely prefer one of these additives over the other because of the ease of mixing
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.
A closed vessel of volume3.0L contains a mixture of neon and fluorine. The total pressure is3.37atm at 0.0°C. When the mixture is heated to 15°C, the entropy of the mixture increases by 0.345 J·K-1
A .400 M formic acid (HCOOH) solution freezes at -0.756 degrees C. Compute the Ka of the acid at that temperature. Presume that molarity is equal to molality. Do calculations to three significant figures and roud off to two for Ka.)
Problem- What is the final temperature (in oC) of a 40 g sample of aluminum (specific heat = 0.900 J/(g K)) which absorbs 88.7 kJ of heat when it warms from 79.7oC
1.what is the ph of the solution created by combining 11.50 ml of the 0.10 m naohaq with 8.00 ml of the 0.10 m
Ideal gases are assumed to have no forces between molecules. What is the effect of attractive forces on the boiling point of a real gas? Explain why
Problem- What is the reaction of a ketoester ( a compound that contains both a keton functional group and an ester functional group) with sodium borohydride
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