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A solution containing 0.0837 M caffeine and 0.0666 M niacin as the internal standard gave R = 423 and R = 347. To analyze a caffeine tablet, 20.0 mL caff niacin 0.146 M niacin and 20.0 mL of caffeine tablet solution were mixed and diluted to 50.0 mL in a VF. Instrument gave R = 553 and R = 582. What is the caff niacin concentration of caffeine in the 20.0 mL caffeine solution?
how many grams of sulfur dioxide could be formed in a mixture of 128 grams of sulfur and 100 grams of oxygen are mixed and ignited.
If solar radiation is 1010 , how many photons strike the leaf every second? Assume three significant figures and an average wavelength of 504 for solar radiation.
Why is lip gloss long lasting containing petroleum? How many metric tonnes of 5%-S coal would be required to yield the H2SO4 needed to produce a 2.0-cm rainfall of pH 2.00 over an area of 100 square kilometers?
The half-life of a certain radioactive element is 1,250 years. What percent of the atoms remain after 7,500 years?
Calculate the mass percent of a solution that is prepared by adding 61.4 g of rm NaOH to 413 g of {rm H_2O}.
Calculate the moles of N2 that will be in 224 L at STP and the partial pressure of O2 in Pa for air at 2.50 atm pressure
A 43 kg person drinks 280. g of milk, which has a "caloric" value of approximately 3.0 kJ/g. If only 19% of the energy in milk is converted to mechanical work.
When 36.8g of benzene reacts with an excess of chlorine gass, the acual yield of 38.8g what is the percentage yield?
3.5 g of a hydrocarbon fuel is burned in a vessel that contains 250. grams of water initially at 25.00 C. After the combustion, the temperature of the water is 26.55 C.
Calculate the osmotic pressure of a solution containing 18.55 of hemoglobin in 13.7 of solution at 24. The molar mass of hemoglobin is .
At 760 K, 15% of a sample of cyclopropane changes to propene in 6.8 min. What is the half-life of cyclopropane at 760 K?
What amount of Potassium Chloride forms when 5.25 litres of Chloride gas at 0.95 atm and 293 K reacts with17.0 g of Potassium
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