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A gaseous sample of this element is bombarded by photons of various energies (in these same units). Match each photon to the result of its absorption (or lack thereof) by an n=1 electron.
Determine the mass of 28.56 mL of acetone and express your answer in grams? also find out the volume, of 6.54 g of acetone and express your answer , in mL?
A sample mixture of CH4 and C2H6 weighing 0.732 g burned to give 2.064 g CO2. What is the mass of CH4 in the mixture.
Calculate the mean and standard deviation of w/v percentage of acetic acid and the 95% confidence interval for the mean. Calcium in a mineral was analyzed five times by each of two methods
An impure sample of potassium hydrogen phthalate, KHP, having a mass of 111.07 g was dissolved in water. This acid sample was neutralized by the addition of 310.0 mL of 0.250 M NaOH
What is the concentration of the H 2 SO 4 if a chemist titrates 300.0 mL of Sodium Hydroxide NaOH with a 5.0 M solution of NaOH and needs only 3.4 mL of the base to reach the endpoint,?
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?
Sodium azide (NaN3) is sometimes added to water to kill bacteria. Calculate the concentration of all species in a 0.010 M solution of NaN3. The Ka value for hydrazoic acid (HN3) is 1.9 * 10-5.
H2C2O4(aq), Ka1 = 6.5 x 10-2 and Ka2 = 6.1 x 10-5. Don't forget that Kw = 1 x 10-14. Then Determine K for the reaction
As gas expands from 1.00 L to 2.50 L against constant pressure of 820 torr. Calculate the change in internal energy for the gas, if 120 J of heat is transferred to the gas during the expansion.
Determine compound having greater Ksp or compound having smaller Ksp ? compute [Ag + ] when CuI just start to precipitate. What % of Ag + remains in solution at this point?
Calculate the pH of a buffer made with 0.50M phosphoric acid and 0.75M sodium dihydrogenphosphate. Ka = 7.5 x 10-3.
N2O4(g) + KCl(s) → NOCl(g) + KNO3(s) Find out oxidation number of each and find which one is reduced and which one is oxidized by Using oxidation number concept? Also write net ionic equation and ionic equation.
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