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A certain microwave delivers 750. watts (J/s) of power to a coffee cup containing 50.0 g of H2O at 25 degrees C. if the wavelength of microwave in oven is 9,75 cm how long does it take and how many photons must be absorbed to make H2O boil?
specific heat capacity for H2O is 4.18 J degrees C-1g-1. Assume only water absorbs energy of microwaves.
A sample of oxygen gas at a pressure of 0.996 atm and a temperature of 195oC, occupies a volume of 714 mL. If the gas is cooled at constant pressure until its volume is 544 mL, the temperature of the gas sample will be oC.
A solution is prepared by mixing 50.0 ml of ethanol with 300.0 ml of water what is the precent of ethanol in this solution. assume the volumes are additive.
Assume that the electrode follows the Nernst equation, the temperature is at 25°C, and that the activity coefficient of X is 1.
Construct a spontaneous voltaic cell using the following materials: A Ni(s) electrode, a copper electrode, a 1.0 M Ni(NO3) (aq) solution and a 1.0 M CuSO4 (aq) solution.
Calculate the molarity of a solution made by dissolving 0.0715 mol Na2SO4 in enough water to form exactly 550. mL of solution
In several states, which state agency has a statutory responsibility for conducting electrical inspections within the state or for seeing that such inspections are conducted properly?
A student is conductiong this experiment, but forgets to temper the lid. therefore it breaks while the hydrate is being heated. the student thinks carefully and replaces the old lid with a new one, collecting the following data. what is the percen..
a compound contains 14.5 g of magnesium and 3.5 g of oxygen. what is the mass percent of oxygen in the
A sample of a gas occupies a volume of 323 mL at 625 torr. At constant temperature, what will be the new volume when the pressure changes to the following:
The resulting solution is then titrated with 0.1041 M sodium hydroxide, and 12.39 mL of the sodium hydroxide solution are needed to reach a phenolphthalein end point.
Consider the following equilibria for phosphoric acid. H3PO4 ? H+ + H2PO4- K1 = 7.11 x 10-3 H2PO4- ? H+ + HPO42- K2 = 6.34 x 10-8 HPO42- ? H+ + PO43- K3 = 4.22 x 10-13
The optical rotation of a sample composed of only D-lactose is determined [a]abs = 0.99 degrees. [a]D is known to be 52.3 degrees for D-lactose. If the cell path length was 0.8 dm and the concentration of D-lactose in the sample was 0.17 g/mL,
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