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An argon ion laser puts out 5.0 W of continuous power at a wavelength of 532 nm. The diameter of the laser beam is 5.5 mm. If the laser is pointed toward a pinhole with a diameter of 1.2 mm, how many photons will travel through the pinhole per second? Assume the light intensity is equally distributed throughout the entire cross-sectional area of the beam (1W= 1 J/s)
Calculate the reaction Zn(s) + 2HCl(aq) ! ZnCl2(aq) + H2(g) What mass of ZnCl2 (MW = 136.3 g/mol) can be prepared from the reaction of 3.27 grams of zinc (MW = 65.38 g/mol) with 3.00 grams HCl (MW = 36.46)?
The inner and outer surfaces a spherical shell with radii of 1cm and 2cm are 300C and 100C respectively .If the thermal conductivity of the shell is 2w/m.k,determine the heat transfear through the shell.
calculate the energy lost when 75.0 g of water cools from 86.4 degrees celcius to 2.1 degrees celcius
Suppose a student is measuring the optical rotation of a 1 M sample of (S)-(-)- Limonene. The path length is 13cm. What optical rotation should the student expect to measure?
Complete and balance the following redox reaction under acidic conditions: Fe2+(aq) + MnO4-(aq)---------------> Fe3+(aq) + Mn2+(aq)
What is the osmotic pressure of a solution made from dissolving 85.0g of glucose in 800ml of water at 19.0 C.
An empty beaker has a mass of 42.889 g. 10.00 mL of NaCl solution are placed in the beaker. The mass of the beaker and solutionis 54.129 g.
Calcium chloride is added to a polymer solution of sodium alginate to cross-link the polymers, reating a thicker mixture which is used to add texture of food (like milk shakes). What is the explanation for why this happens?
calculate teh PH of 2.0m NaCN. what is the concentration of HCN in the solution?
How many grams of water are needed to react with 75.0 g CaCN2?
Rutherford result also showed that the most of the atom's mass is located in the nucleus which has a very small volume.
Analysis with an elaborate instrument indicates that substance A contains two elements. Substance B and substance C react to give a new substance D. Substance E decomposes upon heating to give substance F and substance G. Heating substance H to 10..
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