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A typical 100-watt light bulb consumes 100 J of energy per second. If a light bulb converts all of this energy to 400 nm light, how many photons are produced each second?
A) 5.0x10-28
B) 5.0x10-21
C) 5.0x10-19
D) 2.0x1020
E) 2.0x1029
Combustion analysis of 2.400 g of an unknown compound containing carbon, hydrogen, and oxygen produced 4.171 g of CO2 and 2.268 g of H2O. What is the empirical formula of the compound
Draw a potential energy diagram to illustrate this reaction mechanism, assuming that the overall reaction is endothermic. Label reaction intermediates with "RI", and activated complexes with "AC"
Solution prepared adding 50 mL HCl and 20 mL HNO3 to 300 mL water. More water added until final volume is 1.00 L. Calculate [H+], [OH-], and pH for solution.
one can of soup contains 305 grams of soup. The soup contains .885 grams of salt. What percent of the soup is salt
A certain mixture of He and Ne in a 356 cm3 bulb weighs 0.1480 g and is at 20.0 oC and 748 torr. Find the mass and mole fraction present.
A circular colony of mold with diameter of 4.8 cm and density of 0.0023 g/cm2 what is the mass of object
1 a 0.1967 g sample of pure ascorbic acid is weighed out and dissolved in 50 ml of distilled water in an erlenmeyer
What is the solubility product constant? Given Ksp = 1.1 x 10^-3 for BaF2(s), calculate the molarity of Ba+2 in a saturate solution of BaF2 (at equilibrium).
Ag electrode in 1.0 M Ag + (aq) and Cu electrode in 1.0 M Cu 2+ (aq). What is the cell potential when the solutions are altered, so [Ag+] = 1.25 M and [Cu 2+] =0.25 M
When 0.633 L of Ar at 1.20 atm and 227°C is mixed with 0.185 L of O2 at 501 torr and 127°C in a 400 mL flask at 27°C, what is the pressure in the flask
You have 50 mL of 0.010 fully protonated histidine. how many milimoles of base must be added to bring histidine solution to pH equivalent to the pI of histidine.
a 2.84g sample of an aqueous ionic salt with a molar mass of 99.37gmol is added to a calorimeter ccal 72.1jdegc
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