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A standard Na solution with a concentration of 1.75 ?g/mL Na is added to an unknown concentration of Na. Based on the data below, determine the original concentration of Na as well as its uncertainty in a pure unknown sample.
Unknown (mL) Standard (mL) Final Volume (mL) Emission Intensity
5 0 200 3115 5 200 4545 10 200 6025 15 200 7675 20 200 908
Draw the Lewis Dot Structure for both substances b. Determine the electron pair geometry c. Determine the molecular geometry d. Compare the F - C - F bond angle to the H - S - H bond angle e
The heat capacity of the calorimeter was 15.7J/K. The final temperature in the calorimeter was 32.4 degree C. What is the specific heat capacity of the mineral?
Assuming the solution has a heat capacity of 4.18 J/°C · g and assuming no heat loss to the calorimeter, calculate the enthalpy change for the dissolution of NH4NO3 in units of kJ/mol.
what is the relationship between the dipole moment and the bond moment? how is it possible for a molecule to have bond
Calculate kinetic energy of a 2 ton truck lumbering along at 60 mi/hr.
A sample of 0.50 moles of O2 gas initially at 250K and a pressure of 1.0 atm is compressed to final pressure of 12 atm. The compression can occur via two different paths
Oxygen gas is collected by water displacement from the reaction of sodium peroxide and water. The oxygen gas displaces 318 ml of water at 23 degrees C and 1 atm. What is the pressure of the dry oxygen gas?
What mass of zinc oxide can be produced from the reaction of 415 g zinc sulfide with 265 g of oxygen gas? The other product is sulfur dioxide.
explain what ( if anything) is wrong with the following student's statement: " our solution is red, so we should set the spectrophotometer to the red light range
A 44.2 L sample of a gaseous hydrocarbon, measured at 1.00 atm pressure and 25 C is burned in excess oxygen, liberating 2.55x10^3 kj of heat at constant pressure.
How many grams of commercial acetic acid (97% by mass) must be allowed to react with an excess of to produce 83 of acetyl chloride , if the reaction has a 81.2 yield?
The pKa for the protonation of His to form HisH+ = 6.0. When pH = 7.0, what is the fraction of total histidine that will be in the HisH+ form?
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