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what is the least amount of energy that can be emitted by an excited electron in a hydrogen atom falling from an excited state directly to the n=3 state? what is the quantum number n for the excited
An ideal gas mixture of 1.00g N2 and 3.0g He is placed in a 1.00L container at 30 °C. What is the partial pressure of He
Mixed 1.15g of Na2HPO4 (MW=142g/mol) and 2g NaH2PO4 (MW=138 g/mol) in 1L of water. What is the concentration of your buffer and what is the pH
Water cannot be used as a solvent for the Maleic anhydride + 1,3 cyclopentadiene because. so far all i have got is that anhydrides react toward water, and use dry reagents/apparatus. For a better yi
A weak acid (HA) has a pKa of 4.999. If a solution of this acid has a pH of 4.459, what percentage of the acid is not ionized
The water is brought to the vapor state at 300 degrees celsius and 1,500 kPa, where its internal energy is 2,784.4 kJ/kg and its specific volume is 169.7 cm3/g. Calculate delta U and delta H for the
Determine the concentration of calcium and chloride in the solution in both mg/L and mmol/L. You will need to find the molecular weights on a periodic table.
Determine the number of bonding electrons and the number of nonbonding electrons in the structure of CS2
Hydrogen has three isotopes (1H 2H and 3H) and chlorine has two isotopes (35Cl and 37Cl). How many isotopic kinds of HCl are there. Write the formula for each, and tell how many protons, neutrons, a
How would you make a .500L of a single solution that was 0.00700 M NaCl and 0.143 M KCl? Be complete with your directions (like a recipe with amounts, glassware, etc.)
Calculate the mass of lead [0.0308 {\rm cal}/({\rm g} \times^\circ {\rm C})] that releases 53.5cal as the metal cools from 36.0^\circ C to 25.2^\circ C. If the initial temperature is 28.9^\circ C, w
Sucrose is a nonvolatile, non ionizing solute in water. Determine the vapor pressure lowering at 27C of a solution of 75g of sucrose dissolved in 180 g of water.
Use VSEPR theory to describe the bonding in propene. Also, include bond angles in your explanation.
Determine the vapor pressure lowering at 27C of a solution of 75g of sucrose dissolved in 180 g of water. Vapor pressure of pure water at 27C is 26.7 torr
Ignoring any side reactions and assuming the reaction occurs completely, how large (in kg) an oxygen candle (KClO3) would be needed to supply 8 people with enough oxygen for 24 hours on a small subm
Calculate the pressure in atmospheres using both the ideal gas law and the van der Waals equation. For N2, a=1.35(L^2 x atm)/mol^2, and b=0.0387L/mo
Table salt is comprised of sodium (symbol Na) and chlorine (symbol Cl) in a simple one to one ratio. It is written in chemical shorthand as NaCl. How would you go about finding approximately how muc
A piece of amber was cut into a rectangular solid measuring 5.18cm by 10.8cm by 2.85m . What is the volume in cubic centimeters
At what temperature does the average speed of an oxegen molecule equal that of an airplane moving at 580 mph? Im confused on the setup.
Write the equation for the formation of the precipitate in the test tube containing the saturated solution of calcium hydroxide.
If we assume that the volume change is due entirely to this density change (that is we neglect thermal expansion of the ice/water), what is the difference between the enthalpy change and the energy
What type of bonding is used between the Cu2+ cation and the SO42- anion, in CuSO4 (ionic, covalent...)? Write an equation for the process of solid CuSO4.xH2O dissolving in water.
It is written in chemical shorthand as NaCl. How would you go about finding approximately how much salt there is in our body
How many grams of NaCl would be needed to make 1.5 liters of a solution containing 200mEq of Cl-/liter? 2. How many grams of CaCl2 would be needed to make 0.5 liters of a solution containing 150mEg
If you wanted to know how much carbon there is in a 100kg person, what information would you need? Try to calculate the amount of carbon in a 100kg person.