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a flask contains 30mL of 0.16 M phosphate buffer that has a pH of 7.1. what volume of 0.06M NaOH should be added to increase the pH to 7.6?
What is the molar mass of the unknown compound if the solution has a freezing point of -5 oC?
Calculate the mass of nitrogen dissolved at room temperature in an 78.0 L home aquarium. Assume a total pressure of 1.0 atm and a mole fraction for nitrogen of 0.78.
What mass of oxygen gas is required in order to release 6670 kJ of heat to the surroundings by the following reaction
A compound is constituted by mass of 22.6% phosphorus, the rest being chlorine. Given that a volume of 307 mL of the gas has a mass of 1.55 g at 25 °C and 90 kPa, find the molecular formula for this compound
For the reaction Cl2 + 2KBr -> 2KCl + Br2, calculate the percentage yield if 200 g of chlorine react with excess potassium bromide to produce 410 g of bromine
The most common error students make during a titration is that they add extra NaOH past the endpoint causing the solution to change a dark pink color.
When 0.549 moles of a certain gas fill a balloon the volume is 75 mL. If enough of the same gas is added to the balloon until 1.44 moles of gas are present, what is the new volume of the balloon?
Calculate the density of a cube of unknown mental which weighs 38g and has a side of length 4cm.
The molar mass of corn oil is 890g/mole. How many moles and how many grams of sodium hydroxide are required to react with the 15mL (13.7g) of corn oil? Show your calculations.
A sample of gas with a volume of 750 mL exerts a pressure of 98 kPa at 30 ?C.What pressure will the sample exert when it is compressed to 250 mL and cooled to -25 ?C?
Calculate the standard emf of a cell that uses the Mg/Mg2+ and Cu/Cu2+ half cell reactions at 25 deg C. What is the equation for the cell reaction that occurs under standard-state conditions?
How many joules of heat are given off when 5 g of water cool from 75 degrees C to 25 degrees C?
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