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Half-life equation for first-order reactions: t1/2= .693/k where t1/2 is the half-life in seconds (s), and k is the rate constant in inverse seconds. What is the half-life of a first-order reaction with a rate constant of 1.30×10?4 s^-1? What is the rate constant of a first-order reaction that takes 343 seconds for the reactant concentration to drop to half of its initial value? A certain first-order reaction has a rate constant of 6.90×10?3 s^-1 . How long will it take for the reactant concentration to drop to 1/8 of its initial value?
A 60.0 g sample of an alloy was heated to 96.0 °C and then dropped into a beaker containing 87.0 g of water at 24.1 °C. The temperature of the water rose to a final 27.63 °C.
The atomic mass of element X is 33.42 amu. A 21.83-g sample of X combines with 80.32 g of another element Y to form a compound XY. Calculate the atomic mass of Y.
Calculate the molarity of a solution made by dissolving 0.850 grams of Na2SO4 in enough water to form exactly 930 mL of solution.
Elemental exonium (not a real element) consists of two major isotopes Abundance Mass 55% 98 amu, 45% 114 amu What is the atomic weight for exonium? Answer in units of amu
What magnitude of current is required to produce 1.0 kg of sodium metal in one hour by electrolysis?
44.0 mL of 0.140 M and Na2SO4 and 25.0 mL of 0.160 M KCl Indicate the concentration of each ion present ?
what is the pH of a solution prepared by dissolving 4.5 g HCl in water to make 410 mL of solution?
The mass of an Argon atom is more than that of a Helium atom. Does that mean that because of Argon has larger mass, it exerts a higher pressure on the walls of container than Helium at the same volume, molar density and temperature? Give explanati..
How many grams of F2 are needed to produce 237 g of PF3 if the reaction has a 80.4% yield?
A 0.0355 g sample of an unknown molecular compound is dissolved in 1.000 g of liquid camphor at 200.0°C. Upon cooling, the camphor freezes at 157.7°C. Calculate the molar mass of the unknown compound.
A hydrogen-filled balloon was ignited and 2.00 gram of hyrdogen reacted with 16.0 g of oxygen. How many grams of water vapor were formed?
Balance the equation and answer in terms of moles.Chlorine gas can be produced commercially by passing an electric current through a concentrated solution of sodium chloride (brine).
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