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Ascorbic acid (vitamin C) is a diprotic acid having the formula H2C6H6O6. Asample of a vitamin supplement was analyzed by titrating a 0.1500 gsample dissolved in water with 0.0240 M NaOH. A volume of 16.50 mL of the base was required to completely neutralize the ascorbic acid. What was the percentage by mass of ascorbic acid in the sample ?
The mixture of solutions has a density of 1.220 g/mL and a specific heat of 5.254 J/gC. The empty calorimeter had a heat capacity of 850.0 J/C. The temperature of the entire system rose from 25.6 C to 26.7 C. Calculate the heat of the reaction, in..
An unknown gas composed of homonuclear diatomic molecules (its structure is X2) diffuses at a rate that is 1.07 times that of O2 at the same temperature. What is the identity of the unknown gas
Using the calibration data provided below, calculate the concentration of cocaine (mg/mL) in the original urine sample.
1. assume that the specific heat of the waterh2o 1.00 cavg xc then calculate how many calories of heat are needed to
For the isoelectronic series[V(CO)6]-, Cr(CO)6, and [Mn(Co)6]+, does the energy of the metal to ligand charge-transfer bands increase or decrease with increasing charge on the complex? Why?
Dissolving 4.69g of an impure sample of calcium carbonate in hydrochloric acid produced 1.07 L of carbon dioxide (measured at 20.0 degrees Celcius and 737mmHg). Calculate the percent by mass of calcium carbonate in the sample.
Classify the substances as atomic elements, molecular elements, molecular compounds, or ionic compounds
The acid-dissociation constant for an acid-base indicator HIn is 0.0000438. At 600 nm, the molar absorptivities are 2230 for HIn and 8900 for In-. Calculate the absorbance at 600 nm of a 1.00 x 10-4 M solution of the indicator at pH 4.81 in a 1.00..
you dissolve 15.0g of sucrose C12H22O11 in a cup of water (225g) what is the freezing point of solution (kf of water is -1.86).
Imagine that you have a 5.50 L gas tank and a 2.00 L gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch
at the temperature of twenty five degree celsiusnbsp when 1.00 g of sulfur is burned at constant pressure in an
Ammonia is produced using the Haber process in which nitrogen and hydrogen combine. N2(g) + 3H2(g) => 2NH3(g) How many grams of nitrogen are needed to produce 650 grams of ammonia
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