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How many grams of ethylene glycol (automobile antifreeze),C2H6O2 dissolved in 3.15kg of water is needed to lower the freezing point of water in an automobile radiator to 23.0 C?
During a typical breathing cycle the CO2 concentration in the expired air rises to a peak of 4.6% by volume.
Consider the brilliant blue spectrum (blue 1) shown here. What is the wavelength of maxmal absorbance in nm? (Do not include units in your answer: number only)
Use the bohr model to calculate the wavelength of the light emitted when the electron in a hydrogen atom falls from the = 5 shell to the = 3 shell
Consider a small lake, 0.4 mile across and 11 ft deep, that contains a total of 50 tons of dissolved oxygen. Calculate the BOD (i.e. calculate the amount of oxygen required to degrade the amount of organic waste given)
Construct a rough plot of pH versus volume of added base for the titration of 50 mL of 0.050 M HCN with 0.075 M NaOH. Ka = 4.0*10^-10 for HCN (a) What is the pH before any NaOH is added? pH = 5.36 (b) What volume of base, in milliliters, is requir..
A quantity of ice at 0°C is added to 66.4 g of water in a glass at 55°C. After the ice melted, the temperature of the water in the glass was 15°C. How much ice was added? The heat of fusion of water is 6.01 kJ/mol and the specific heat is 4.18 J/(..
a sample of riboflavin has a molar absorptivity of 1.67 x 10^3 L(mol x cm). What is the concentration of a solution with an absorbance of 0.484? The pathlength is 1.00cm.
A certain first-order reaction () has a rate constant of 6.90×10-3 at 45 . How many minutes does it take for the concentration of the reactant, , to drop to 6.25 of the original concentration?
How many silver atoms can be produced if 0.00350g of Cu are reacted with excess AgNO3, according to the equation :Cu + 2AgNO3 yields 2Ag + Cu(NO3)2
Need to dissolve CaCl2 in water to make a mixture that is 38.5% calcium chloride by mass. If the total mass of the mixture is 886.2g
Write the two chemical equations that show the titration reactions of the carboxylic acid group and the amino group of glyclyglycine
Assuming the density of water is 1.00g/mL at ambient temperature, what is the exact volume (in mL) of the 250-mL Erlenmeyer flask?
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