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Calculate individual concentrations in an unknown mixture... Calculate the individual concentrations of C and of D in the following unknown mixture: Compound C: Absorbance at 365nm = 0.150 Absorbance at 470nm = 0.642 Concentration = 1.00 X 10^-4 Compound D: Absorbance at 365nm = 0.684 Absorbance at 470nm = 0.088 Concentration = 2.00 X 10^-4 Unknown Mixture: Absorbance at 365nm = 0.721 Absorbance at 470nm = 0.604 Concentration
How much heat is required to warm 227 g of ice from -44.9°C to 0.0°C, melt the ice, warm the water from 0.0°C to 100.0°C, boil the water, and heat the steam to 173.0°C?
A sample of oxygen is collected over water at a total pressure of 690.7 mmHg at 19°C. The vapor pressure of water at 19°C is 16.5 mmHg. What is the partial pressure of O2
Compound A has a parent peak of M+ = 95 m/z in its mass spectrum and shows a medium intensity sharp infrared absorption band at 2280 cm. The HNMR of compound A shows 3 signals in a 4:4:1 ratio.
What is the big difference between concentrated and aqueous acids, and what role would that difference play in the reaction between 9-fluorenol and sulfuric acid?
Chlorine gas can be prepared in the laboratory by the reaction of manganese dioxide with hydrochloric acid. How much MnO2 should be reacted with excess HCl to obtain 275 mL of chlorine gas at 5.0 °C and 650 mmHg?
A piece of copper alloy with a mass of 60.0 g is heated from 21.0 ?C to 44.0?C. In the process, it absorbs 507 J of energy as heat. What is the speci?c heat of this copper alloy.
Many organic chemists when making a new solid compound often first try ethanol as a recrystallizing solvent. If soluable at room temperature, they simply add water and this often works! Why?
Which one of the following actions will cause an increase in the equilibrium concentration of NO(g) in a closed reaction chamber?
The best means of personal protection from radiation for emergency responders is the implementation of three basic principles: time, distance and shielding. Please show your work when answering the following questions:
How many moles of methane (CH4) are required to react completely with 139 L of carbon tetrachloride according to the following reaction at 0 C and 1 atm
A student determined the calorimeter constant of the calorimeter. The student added 50.00 ml of cold water to 50.00 ml of heated distilled water in a Styrofoam cup the initial temperature pf the cold water was 21.00 degrees Celsius
Caffeine (C8H10N4O2) is a stimulant found in coffee and tea. If a solution of caffeine in chloroform (CHCl3) as a solvent has a concentration of 0.0870 m, calculate the following. (a) the percent caffeine by mass (b) the mole fraction of caffeine
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