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At equilibrium state for a reaction between Hydrogen and Iodine to give hydrogen at 675 k in 5 liter flask that contains 0.4 mole of hydrogen , 0.4 mole of iodine and 2.4 mole HI. calculate the equilibrium constant
Use atomic mass unit approach to determine the mass of 2.00*10^13 atoms of rubidium
Example of periodic table using hypothetical elements with pictures and explanation.
calculate the amount of energy required or realeased to cool down 12.5g of steam from 125.0 degree celsius to ice at -20 degree celsius
A buffer solution is prepared by dissolving 1.50 g each of benzoic acid, C7H6O2, and
sodium benzoate, NaC7H5O2, in 150.0 mL of solution. [Ka = 6.3 x 10 -5 ]
a. What is the pH of this buffer solution?
b. Which buffer component must be added, and in what quantity, to change the
buffer pH to 4.00?
c. What quantity of 2.0 M NaOH or 2.0 M HCl must be added to the original buffer to
change the pH to 4.00.
In a Laboratory, you have the following chemicals available:
1.0 M NaOH, 1.00 M HCl, 1.00 M H3PO4, NaH2PO4 (s), Na2HPO4 (s), and Na3PO4
(s).
Describe TWO ways of making 1000 mL of a buffer of pH = 12 (Use only the above
chemicals, plus distilled water.)
[Given: H3PO4 - Ka1 = 6.9 x 10 -3 ; NaH2PO4 - Ka2 = 6.2 x 10 -8 ; Na2HPO4 - Ka3 = 4.8 x 10 -13 ]
8. How many grams of CaCl2 will be dissolved in 50 kg of water at 70°C?
9. What amount of water is needed to dissolved 450g of Pb(NO3)2 at 40°C?
10. How many grams of water must be added to 35g of KNO3 to produce a saturated solution at 30°C?
Describe which of the following is unsaturated, saturated, or supersaturated? All solutions are prepared from 100 g of water.
a. 60 g KCL at 60°
b. 60 g K2Cr2O2 at 60°C
c. 60 g Pb(NO3)2 at 25°C
What mass of solute will dissolve in 100 g water at the following temperatures?
a. NaNO3 at 10°C
b. K2Cr2O7 at 30°C
c. NaCl at 50°C
Are these ionic, molecular, or mixture?
0.10 M acetic acid
0.0010 M hydrochloric acid
0.010 M hydrochloric acid
0.10 M hydrochloric acid
1.0 M hydrochloric acid
#339914 on Dec 2023