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What is the pH of the buffer that result when 12 g of NaH2Po4 and 8.00 g of NaHPO4 are diluted with water to a volume of 0.50 L ? ( Ka of H2PO4- = 6.2*10^-8 , the molar masses of NaH2PO4 and Na2HPO4 are 120.0 g/mol and 142.0 g/mol respectively).
A bottle contains 225 mL of insulin at a concentration of 50.0 mg/mL. What is the total mass of insulin in the bottle?
diatomic oxygen to form nitric oxide and water vapor: 4NH3 + 5O2 > 4NO + 6H2O When 20.0 g NH3 and 50.0 g O2 are allowed to react, which is the limiting reagent? How much water is produced and how much is left of the excess reagent
a sample of argon is at a pressure of 1.24*10^4 kPa of 24 degrees c in a rigid 25-L tank. How many moles of argon does this tank contain?
Calculate the molar mass of a gas that has a density of 143 g/mL at 23 degrees celcius and a pressue
A 70.0 g steam sample at 150.0 degree Celsius was converted to ice at -150.0 degree Celsius, calculate the total amount of heat removed in the process.
explain the probable effect of this procedural change on the experimental results?
calculate the vapor pressure of the pressure cooker if the temperature inside the pressure cooker is 119 degree celcuis.
HZ is a weak acid. An aqueous solution of HZ is prepared by dissolving 0.020 mol of HZ in sufficient water to yield 1.00 L of solution
The mass of an average blueberry is 0.72 g and the mass of an automobile is 1900 kg. Find the number of automobiles whose total mass is the same as 1.0 {rm mol} blueberries.
an 18-karat gold necklace is 75 gold by mass 16 silver and 9.0 copper. how many grams of copper are in the necklace? if
derive the rate equation in terms of [NO] and [O2] as well as k ( Assume N2O2 to be in a steady state )
Explain why bubbles are observed to emerge from the jar when it is in the boiling water. b. Explain why the lid "pops down" on the jar top soon after removing the jar from the boiling water.
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