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What mass of potassium carbonate is needed to prepare 550. mL of an aqueous solution with a potassium concentration of 0.175M?
determine How many formula units(formula un) of sodium iodide(NaI) are present in 9.54 grams of this compound and also calculate how many gms of sodium iodide are present in 6.07E+21 formula units of this compound.
placed in 1.00*10^3 g of water at 25C. final temp of this mixture was 26.3C. What is specific heat of metal?
Is the reaction described by the following equation at equilibrium. if not, in which direction will the reaction proceed to attain equilibrium. C(s) + CO2(g) +2CO(g) Kp=1.90atm
The pH of a solution of a weak acid is found to be 4.625. If 10.000 mL of this solution is titrated with 7.3990 mL of 0.012500 M NaoH, what is the Ka of this acid
Problem- Using 25 mL volumetric flaks, prepare a minimum of 5 dilutions of the stock 250 ppm calcium solution to cover the range of 1-20 mg/L of calcium. Diluting to the mark with 0.50 M HCl.
An experiment shows that a 115 -,mL gas sample has a mass of 0.170 g at a pressure of 711 mm; Hg and a temperature of 33Celcius. What is the molar mass?
If the concentration of bromide ion in a saturated solution in equlibrium with PbBr2 solid is determined to be .0125M what is the solubility of PbBr2
A beaker with 1.30×102 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M .
When 34.1 g of lead reacts with 6.81 L of oxygen gas, measured at 1 atm and 25.0 degree C, 36.1 kJ of heat is released at consstant pressure. What is DeltaH for this reaction
a. Which functional group does each chemical belong to? Explain. b. How does the type of bonding and functional group these molecules posses affect their reactivity?
calculate the mass of vapour present in a room of volume 250 meter cube that contains air at a temperature of 23
What are the two pKa values for carbonic acid? What is the pH of a 0.100M solution of potassium bicarbonate. What is the pH of a 0.100M solution of potassium carbonate
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