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What is the half-life (in minutes) of this reaction?
For a given first order reaction, the rate constant is 0.00059 s-1. If the initial concentration of is 4.50×10−2 . What is the half-life (in minutes) of this reaction? I need the steps to be able to work out this problem. Thankx
2 AnswersChemistry1 decade agovapor pressure question in chemistry?
What is the vapor pressure (in mm Hg) of a solution of 18.2 of glucose (C6H12O6) in 94.6 of methanol (CH3OH) at 27 degrees Celsius? The vapor pressure of pure methanol at 27 degrees Celsius is 140 mm Hg, I need to know how to set up the problem as well as get the answer. Thank you.
1 AnswerChemistry1 decade agoHow many grams of a 0.0021 m aqueous solution of nalorphine (C19H21NO3) are needed to obtain a dose of 2.25 mg?
How many grams of a 0.0021 m aqueous solution of nalorphine (C19H21NO3) are needed to obtain a dose of 2.25 mg? I need to know how to set up the problem as well as get to the answer. Thank you.
1 AnswerMathematics1 decade agoFreezing point question?
What is the freezing point in degrees Celsius of a solution of 15.7 g of LiCl in 136 g of water, assuming complete dissociation? For water K= -1.86 degrees Celsium kg/mole. I need to know how to set up the problem as well as how to solve it. Thank you.
1 AnswerChemistry1 decade agoOsmotic pressure in chemistry question?
What osmotic pressure (in atmospheres) would you expect for 72 mL of an aqueous solution containing 2.4g of sodium acetate (NaCH3CO2) at 16 degrees Celsius? I need to know how to set up the equation as well as finding the answer. Thank you.
1 AnswerChemistry1 decade agoMass percent in chemistry question?
A 0.498 M solution of lactose, C12H22O11, in water has a density of 1.0432 g/mL at 20 degrees Celsius. What is the mass percent of lactose in this solution? I need to know how to set up and then get the answer to this problem. Thank you.
1 AnswerChemistry1 decade agoWhat is the magnitude of the net gravitational force on the mass at the origin due to the other two masses?
Three identical masses of 640 kg each are placed on the x axis. One mass is at x1 = -10.0 cm, one is at the origin, and one is at x2 = 36.0 cm. Take the gravitational constant to be G = 6.67×10−11 N * m^2/kg^2.
Can someone solve for this and show me how they arrived at the answer? Thank you.
2 AnswersPhysics1 decade agofreezing point of a solution?
What is the freezing point (in degrees C) of each of the solutions below? For water, K = 1.86. The vapor pressure of water at 45.0 degrees C is 71.93 mm Hg. A solution of 10.0 g of in 166 g of water at 45.0 degrees C, assuming complete dissociation. And can you show me how you got to the answer? Thank you.
1 AnswerChemistry1 decade agoHow much time does it take for the package to reach the ground in s?
A helicopter is ascending vertically with a speed of 5.90 m/s. At a height of 118 m above the Earth, a package is dropped from a window. The package's initial speed equals the helicopter's, Can you give me the equation for this as well as the answer?
1 AnswerPhysics1 decade agoestimate the speed of the car just before braking in m/s?
In coming to a stop, a car leaves skid marks 90 m long on the highway. Assume a deceleration of 7.20 m/s^2
1 AnswerPhysics1 decade agoFrom what height above the top of the window did the stone fall?
A falling stone takes 0.28 s to travel past a window 2.2 m tall
1 AnswerHomework Help1 decade agoHow long will it take the car to reach the truck?
A car traveling 92 is 140 behind a truck traveling 78 .
1 AnswerHomework Help1 decade ago