11/13/22

Ethanol combustion reaction is given below. CH3CHZOH() 302(g) 2C02(g) 3H2O(g) AH = - 1236 kJ a) If 15.3 grams of C2H5OH is converted to products, how much heat; in kJ and in kcal, is absorbed?
calculate the number of moles in 15.3 grams of ethanolmolar mass ethanol = 46.07 g/molmoles ethanol = mass ethanol/molar mass of ethanolmoles = 15.3 / 46.07 = 0.3321 moles ethanolwe know that... more
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11/13/22

What is the molarity of ZnCl2 that forms when 20.0 g of zinc completely reacts with CuCl2 according to the following reaction? Assume a final volume of 260 mL . Zn(s)+CuCl2(aq)→ZnCl2(aq)+Cu(s)
mass of Zn = 20.0 gmolar mass of Zn = 65.4 g/molnumber of moles of Zn = mass / molar mass= 20.0/65.4= 0.306 mol Zn = moles of ZnCl2 formed  (since the stoichiometric factor is 1:1)volume = 260 mL =... more
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10/10/12

How many photons are produced?
How many photons are produced in a laser pulse of 0.528 J at 679 nm?
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