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During World War II, tritium (3H) was a component of fluorescent watch dials and hands. Assume you have such a watch that was made in January 1944. If 16% or more of the original tritium was needed to read the dial in dark places, until what year could you read the time at night? (For 3H, t1/2 = 12.3 yr.)
A 50.00-mL sample of aqueous Ca(OH)2 requires 34.66 ml of a 0.966 M nitric acid for neutralization. Calculte the concentration (molarity) of the original solution of calcium hydroxide
Determine which of the following reactions are oxidation-reduction reactions and which are not. what type of reaction do you have if it is not an oxidation-reduction reaction?
The pH of an aqueous solution containing only a monoprotic weak acid has a pH of 4.1. What is the concentration of hydronium ion, H3O+, in the solution? (a)2 x 10?3 M (b)2 x 10?4 M (c)8 x 10?4 M (d)8 x 10?5 M (e)0.61 M
Refrierators are usually kept at about 5 degrees Celcius, while room temperature is about 20 degrees Celcius. If you were to take an "empty" sealed 2 liter soda bottle at room temperature and place it in the fridge, would you expect it to contract..
What volume (in milliliters) of 0.100 M NaOH should be added to a 0.120 L solution of 0.024 M glycine hydrochloride
if a room has a volume of 127m3 then calculate its volume a in km3? b in dm3? c in cm3?a suspension of an infant
If 2.55 mol of ethane (C2H6) undergo combustion according to the unbalanced equation C2H6 + O2 -→ CO2 + H2O , how much oxygen is required? Answer in units of mol.
A 1.50 mole sample of an ideal gas is allowed to expand adiabatically and reversibly to twice its orignal volume. In the expansion the temperature dropped from 296ºK to 239ºK. Calculate ?E and ?H for the gas expansions
What is the concentration of each species present when equilibrium is reached? b. What is the value of Kc for this reaction at 500K?
Write a balanced chemical equation for the reaction: Na2CO3 and AgNO3? And Its ionic equation please
A 75.0 L steel tank at 20.0C contains acetylene gas (C2H2) at a pressure of 1.39 atm. Assuming ideal gas behavior, how many grams of acetylene are in the tank?
What is the density in g/L of a gas mixture that contains 27% F2 and 73% He by volume at 714 mm Hg and 27.5 C.
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