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a sample of an ethanol-water solution has a volume of 54.2 cm3 and a mass of 49.6g. what is the percentage of ethanol in the solution?
if 150g of water is collected during complete combustion of 166g of butane with ocyben, calculate the percent yield of water.
b. Would the pH increases or decreases if the solution is disturbed by adding HBr?
What is the molarity of a calcium hydroxide solution if a 25.0 mL sample is exaclty neutralized by 42.5 mL of 0.0750 M nitric acid?
Draw sodium formate by placing atoms on the grid and connecting them with bonds. Include all lone-pair electrons.
What is the molarity of a solution which contains 58.5g of sodium chloride dissolved in 0.500 L of solution?
At room temperature (20), milk turns sour in about 65 hours. In a refrigerator at 3, milk can be stored three times as long before it sours. What is the activation energy of the reaction that causes the souring of milk?
A hiker caught in a thunderstorm loses heat when her clothing becomes wet. She is packing emergency rations that, if completely metabolized, will release 30 kJ of heat per gram of rations consumed.
A 25-g sample of an alloy at 92 degrees celsius is placed in 50 grams of water at 20 degrees celsius. If the final temperature reached by the alloy sample and water is 27 degrees celsius.
What is the reaction that occurs with hexanal and propanol (give both the hemiacetal and acetal products)?
The heat of neutralization of HCl by NaOH is H°rxn = -56.2 kJ/mol. How much heat is released when 125 mL of 1.750 M HCl is mixed with 195 mL of 0.667 M NaOH.
Multiple choice questions in free energy change and What is the free energy change in kJ/mole?
What is the formula weight of KI? What quantity of KI is present in 301 mL of a 0.30 M solution?
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