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Determine the number of joules in a Btu. The use of the British thermal unit (Btu) is common in much engineering work. A Btu is the amount of heat needed to raise the temperature of 1lb of water by
Explain how are moles measured for KMnO4 if the molarity is 0.01 M and there are 33mL? Also, how do you change the moles to coefficients?
The initial sample weighed 0.5488 g; the mixture of Al2O3and SnO2 weighed 0.7712 g. A mixture of powdered aluminum and tin was burned in an atmosphere of oxygen in a way such that the resulting
A student shines a light of greater than the threshold frequency upon the surface of the metal in a photoelectric effect experiment. She observes that after a long time, the number of ejec
Determine the balloon volume before any reaction occurs. Determine the volume if the reaction goes to 30% completion. Suppose that STP remains constant both inside and outside the balloon.
Potassium hydrogen phthalate KHC8H4O4 is used to standardize a solution of bases. The acidic anion reacts with stone bases according to the following net ionic equation.
Determine the maximum pressure and temperature that would be generated by the explosion. Suppose the ideal gas products, adiabatic conditions and the total heat capacity at the constant volume for t
2.253 grams of the drug candidate was ignited and 6.035 g of carbon dioxide and 1.481 g of water vapor were detected. A combustion analysis was attempted to elucidate the molecular formula of this s
The molar mass of this substance was measured to be 334g/mol in a freezing point depression experiment. A molecule being considered as a drug candidate, CxHyOz consists of only hydrogen, oxygen and
Calculate the maximum number of electrons in an atom that can have the following set of quantum numbers:
The first end point volume (phenolphthalein endpoint) is 11.60 mL and the second end point volume (bromocresolgreen end point) is 41.93 mL. A sample weighing 0.3375 g and containing Na2CO3 (106
Calculate the pKa of such an indicitator for the titration of 25.00 mL of 0.1000 M KHP with 0.1000 M NaOH. Ka for KHP is 3.89x10-6, kw = 1.0x10-14.
Assuming that the volumes are additive, calculate the total solution volume in the beaker when the pH is 12.30? A beaker contains 25.00 mL of 0.1000 M acetic acid (HOAc, Ka =1.8x10-5). 0.1000 M NaOH
A particular solution of sodium acetate has a ph of 9.07 and a density of 1.0085g/mL. Describe the molality of this solution and the freezing point? In aqueous solution, sodium acetate behaves as a
If a typical home uses 390 kWh of electricity per month, determine the numbers of square meters of solar cells would be needed to meet its energy requirements?
Determine the heat of formation of P4O10(s) under these conditions. When 10.00 g of phosphorus is burned in O2 (g) to form P4O10 (s), enough heat is generated to raise the temperature of 295
Explain why is it necessary to have water running through the condenser from the bottom to the top and when an air is cooled condenser acceptable?
Suppose ideal behavior for vapor. The molar enthalpy of vaporization of water at 100C and 1 bar is 40.0 kJ/mol. Determine the value of ΔS for the conversion of n = 1 mol of liquid water at 10
The density of the solution is 1.21 g/ml and the density of the water is 1.0g/ml. A student taken 10.0 ml of this solution and dilutes it with water to 250 ml (3 SF).
What is the percentage of KHP in this sample? In the titration of an impure sample of KHP, it was found that 6mL of 0.100M NaOH was needed to react totally with 0.765g of sample.
Calculate the molarity of the NaOH solution if 25.21 mL of NaOH solution us needed to react completely with the 0.550g KHP,
Arrange the following atoms in order of increasing ionization energy: oxygen, lithium, strontium, chlorine, tellurium and magnesium. Explain your order.
W heel removing an electron in N2 weakens bonding, explain using molecular orbital theory why removing an electron inO2 strengthens bonding.
Which would show an absorption band at a larger wave number: a carbonyl group bonded to an sp2 carbon or a carbonyl group bonded to an sp3 carbon?
Determine the concentration of HOAc remaining after mixing 30.0 mL of 0.100 M HOAc with the 5.00 mL of 0.200 M NaOH.