Questions asked by Anna
- Back to user's profile
-
What is the theoretical yield (in g) and percent yield of water in the reaction (%) ?
-
How many moles of sodium hydroxide are present in 50.00 mL of 0.09899 M NaOH solution?
-
What is the concentration of the acid if the initial burette reading is 2.14 mL and the burette reading when the endpoint observed was 21.62 mL?
-
Why is it ok to wash the sides of a flask with DI water during titration even though you are diluting the acid present?
-
What is the net ionic equations for the formation of each of the precipitates observed?
-
What is the general format of how to do titration problems involving finding the concentration of the original acid solution?
-
How do you know which ions remain in solution?
-
What is the general format used to find the concentration of an ion in a chemical equation?
-
Which orbital could this be.. 4py, 4dyz, 5py or 5dyz?
-
What is the mass of silver ring? (Assume a density of 0.998 g/mL for water.)
-
What is the final temperature of both the weight and the water at thermal equilibrium?
Express the temperature in Celsius to three significant figures.
-
How much boiling water would you need to raise the bath to body temperature (about 37 ∘C)? Assume that no heat is transferred to the surrounding environment.
Express your answer to two significant figures and include the appropriate units.
-
When 0.602 g of biphenyl (C12H10) undergoes combustion in a bomb calorimeter, the temperature rises from 26.5 ∘C to 30.4 ∘C. What is the ΔErxn for the combustion of biphenyl? The heat capacity of the bomb calorimeter is 5.86 kJ/∘C.
-
If a bottle of nail polish remover contains 176 mL of acetone, how much heat would be released by its complete combustion? The density of acetone is 0.788 g/mL.
-
What is the heat capacity #C_"cal"# of the dry calorimeter device?
-
What is Hrxn?
-
What is the change in enthalpy for this gas-phase reaction between potassium and bromine?
-
For which of the following reactions is ΔH∘rxn equal to ΔH∘f of the product(s)?
-
What is ΔHrxn for the reaction below?
I thought the answer was -109 kJ but it was wrong.
-
What is the enthalpy change for the reaction?
-
What mass of carbon dioxide is present in 1.00 m3 of dry air at a temperature of 21 ∘C and a pressure of 649 torr ?
-
To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 3.5-L bulb, then filled it with the gas at 1.40 atm and 30.0 ∘C and weighed it again. The difference in mass was 5.5 g . What is the gas?
-
If 1.00 mol of argon is placed in a 0.500-L container at 23.0 ∘C , what is the difference between the ideal pressure and the real pressure?
-
A 3.00-L flask is filled with gaseous ammonia, NH3. The gas pressure measured at 20.0 ∘C is 2.55 atm . Assuming ideal gas behavior, how many grams of ammonia are in the flask?
-
15.0 moles of gas are in a 6.00 L tank at 24.3 ∘C . What is the difference in pressure between methane and an ideal gas under these conditions?
-
Including: # of particles, temperature, average kinetic energy, molar mass, average velocity, electronegativity and atom size, which of these are the same or different for all of the elements?
-
A mixture containing 22.4 g of ice (at exactly 0.00 ∘C) and 78.7 g of water (at 62.1 ∘C) is placed in an insulated container. Assuming no loss of heat to the surroundings, what is the final temperature of the mixture?
-
What is the #DeltaH_"vap"# for ethanol and propane?
-
How many grams of ice at -13.1 ∘C can be completely converted to liquid at 26.5 ∘C if the available heat for this process is 5.52×103 kJ ?
-
Find the mass of urea, #"CO"("NH"_2)_2#, needed to prepare #"49.0 g"# of a solution in water in which the mole fraction of urea is #7.58 * 10^(−2)#?
-
What is the rate of reaction in terms of the appearance of product C between time = 0 s and time = 20 s?
-
What are the reaction orders for A, B, and C?
-
What is the equilibrium constant, #K_c#, for the reaction at this temperature?
-
What is Kp?
-
Initially, only A and B are present, each at 2.00 M. What is the final concentration of A once equilibrium is reached?
-
What is the final concentration of D at equilibrium if the initial concentrations are [A] = 1.00 M and [B] = 2.00 M ?
-
What is the molarity of sodium hydroxide solution?
-
What volume of a concentrated HCl solution, which is 36.0% HCl by mass and has a density of 1.179 g/mL, should be used to make 5.10 L of an HCl solution with a pH of 1.7?
-
What volume of an HCl solution with a pH of 1.3 can be neutralized by one dose of milk of magnesia? If the stomach contains 220 mL of pH 1.3 solution, will all the acid be neutralized?
-
What is the [OH−] for a 0.026 M solution of Sr(OH)2?
-
What is the pH of a 0.026 M Sr(OH)2 solution?
-
#"20.0 mL"# of glacial acetic acid (pure #"CH"_3"COOH"#) is diluted to #"1.30 L"# with water. The density of glacial acetic acid is #"1.05 g/mL"#. What is the pH of the resulting solution?
-
What is the ClO− concentration of a mixture that is 0.310 M in HF and 0.100 M in HClO?