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when titrating hcl with na2co3, why does the color change from blue to green or yellow near the endpoint of titration when the indicator is bromocresol green?
A sample of HCl gas is placed in 326mL flask where it exerts a pressure of 67.5 mmHg. What is the pressure of this gas sample if it is transferred to a 135mL flask at the same temperature?
A student is concentrating a solution having a polypeptide of modest molecular weight by pressure filtration through a membrane. The solute concentration on the feed side of the membrane is 0.10 M and the temperature is twenty five degree celsius.
Calculate the heat of combustion of napathalien on a molar basis. Find the molar heat of comb.: q/1 mol. of napthalien
Explain how to correct for the partial of water vapor when calculating the partial pressure of a dry gas is collected over water?
Draw Lewis dot structures for each of the following molecules.
The atomic mass of element X is 22.99 amu. A 19.98-g sample of X combines with 16.51 g of another element Y to form a compound XY. Calculate the atomic mass of Y.
sodium hydroxide to make sodium phosphate and water. How many L of the H3PO4 solution will react with 0.281 L of the NaOH solution? Give your answer to 3 decimal places.
how is the rate of consumption of O2 related to the rate of consumption of NH3 in the reaction 4NH3 + 5O2 -->4NO +6H2O?
how much of this chemical would have been measured? Express in terms of measured concentration C (mg/litre) of the filtered sample?
The vapor pressures of pure benzene and pure toluene at 25 C are 94.2 torr and 28.4 torr, respectively. Assuming ideal behavior
determine the structures of Compounds A, B, C, D, and E. Show calculations. Support all of your structure determinations. Student performed a sodium borohydride reduction experiment.
Determine the mass of CO_2 produced by burning enough carbon (in the form of charcoal) to produce 490 kJ of heat.
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