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The mass of the crucible, cover and sample of Ti was 36.383 g. Following the reaction of the Ti metal with Oxygen, the contents of the crucible, cover and reaction mixture was heated to a constant m
An unknown gas contains 82.6% C and 17.4% H by mass. It effuses at 0.87 times the rate of CO2 gas under the same conditions. What is the molecular formula of the gas
Phosphorus-32 has a half-life of 14.0 days. Starting with 2.00g of P^32, how many grams will remain after 70.0 days? Express your answer numerically in grams.
A first order reaction has an Arrhenius constant for the reaction is 9.4 x 1010 sec ^-1, and an activation energy of 64.4 kJ. At what temperature (in Celsius) is the rate constant equal to 0.472 sec
A first order reaction has a rate constant of 0.342 sec-^1 at 29.5 degrees C. If the activation energy is 69 kJ, calculate the temperature in degrees C at which the rate constant is 0.428 sec^-1.
The balanced chemical reaction for the titration performed in this lab demonstration is: NaCOOH(aq)+NaOH(aq)=Na(CH3COO)(aq)+H2O(l). A basic solution has positive ions and OH- ions like Na+ and OH-.
Is there a good reason to use a clean filter flask when filtering off your crop of recrystallized product
You have 200 moles of nitrogen in a cylinder,(having a weightless,frictionless piston). The initial temperature is 298k. The diameter is 0.5m. and the piston is at a height of 1m.
write a chemical equatin representing the third ionization energy for lithium. use e- as the symbol for an electron
A 0.5M aqueous solution of hypobromous acid (for which Ka=2.3 * 10*-9) has what pH ? a. 6.78 b. 5.36 c. 4.47 d. 3.39 Please show the counting process.
What mass of sodium chloride would need to be added to the blood to bring the sodium ion concentration up to 0.140 M , assuming no change in blood volume
The diameter of the cylinder is 0.5m. and the piston height is 1m. a.what is the mass of the weights on the cylinder? b.You heat the gas to 1000k. how high will the cylinder rise? c.How much work wi
The initial temperature is 298k. The diameter of the cylinder is 0.5m. and the piston height is 1m. a. what is the mass of the weights on the cylinder
Water solubilities of oxalic acid and sodium oxalate at RT are 10g/100 ml and 3.7 g/100 ml respectively. Could you prepare oxalic acid by adding HCl to a solution of sodium oxalate, cooling it to ro
What is the mass in grams of the hydrogen gas obtained? The vapor pressure of water at 20 degrees C is 17.54 mmHg.c
Write the balanced net ionic equation for the reaction that occur in the following case. Fe(NO3)2(aq)+KOH(aq) Express your answer as a balanced net ionic equation. Identify all of the phases in your
Write the balanced net ionic equation for the reaction that occur in the following case. Ba(NO3)2 (aq) + K2SO4(q) Express your answer as a balanced net ionic equation.
how does structure help predict and affect the Rf of each compound based on intermolecular forces
Propose a structure for an amine of formula C4H9N, which does not liberate a gas when treated with NaNO2 and HCl, and has IR absorptions at 917 cm-1, 990 cm-1, and 1640 cm-1, as well as an N-H absor
Propose a structure for a C6H15O2N compound that is unstable in aqueous acid and has the following NMR spectra: 1H NMR: ? 2.30 (6H, s); ? 2.45 (2H, d, J = 6 Hz); ? 3.27 (6H, s); ? 4.50 (1H, t, J = 6
Calculate the volume (in liters) occupied by 1.51 moles of nitric oxide (NO) at 7.50 atm and 57 degrees C 16. What is the volume (in liters) occupied by 43.7 g of HCl at STP
Propose a structure for an amine of formula C4H9N, which liberates a gas when treated with NaNO2 and HCl. The 13C NMR spectrum is as follows, with attached protons in parentheses
Provide a structure for the following compound: UV spectrum: ?max = 272 nm (? = 39,500); EI mass spectrum: m/z = 129 (molecular ion and base peak); IR: 2200, 970 cm-1; 1H NMR: ? 5.85 (1H, d, J = 17
Identify the compound: molecular mass 113; gives a positive hydroxamate test; IR: 2237, 1733, 1200 cm-1; 1H NMR: ? 1.33 (3H, t, J = 7 Hz), ? 3.45 (2H, s), ? 4.27 (2H, q, J = 7 Hz). Please draw the s
Dissolving 4.69g of an impure sample of calcium carbonate in hydrochloric acid produced 1.07 L of carbon dioxide (measured at 20.0 degrees Celcius and 737mmHg). Calculate the percent by mass of calc