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A rigid tank contains 1.50 moles of an ideal gas. Determine the number of moles of gas that must be withdrawn from the tank to lower the pressure of the gas from 29.2 atm to 5.20 atm.
A medical researcher has 40% and 5% solutions. How much of each solution must she mix to get 0.6 liter of a 20% solution?
How much of a 50% acid solution should be added to 40 gallons of a 25% acid solution to make a mixture that is 30% acid?
When a 7.00g sample of KCN is diisolved in water in a calorimeter that has a total heat capacity of 5.989 KJ K^-1, the temperature decreases by 0.2010 K. Calculate the molar heat of solution of KCN.
You take an aspirin tablet (a compound consisting solely of carbon, hydrogen, and oxygen) with a mass of 1.00 g, burn it in air, and collect 2.20 g of carbon dioxide and 0.400 g water. The molar mas
A substance contains 35.0 g nitrogen, 5.05 g hydrogen, and 60.0 g of oxygen. How many grams of hydrogen are there in a 185-g sample of the substance?
The degree of agreement among several measurements of the same quantity is called__________. It reflects the reproducibility of a given type of measurement.
A 3.00-g sample of an alloy (containing only Pb and Sn) was dissolved in nitric acid(HNO3). Sulfuric acid was added to this solution, which precipitated 2.93 g of PbSO4. Assuming that all of the lea
A 90% antifreeze solution is to be mixed with a 75% solution to make 30 liters of an 80% solution. How many liters from each solution should be used?
0.80g of sodium hydroxide (NaOH) pellets are dissolved in water to make 6.5L of solution. What is the pH of this solution?
How many grams of H2O will be formed when 32.0 g H2 is mixed with 32.0 g O2 and allowed to react to form water?
How many grams of Ca(NO3)2 can be produced by reacting excess HNO3 with 7.40 g of Ca(OH)2?
A 3.140 molal solution of NaCl is prepared. How many grams of NaCl are present in a sample containing 3.000 kg of water?
At pH 9.2, seconal absorbs at 239 nm. At pH 13, the absorbance shifts to 254 nm. Of what class of compounds is this characteristic and why?
Would you use UV spectrophotometry to screen for either or both of methamphetamine and diazepam compounds?
What was the concentration of tylenol in the solution? If the absorbance of a basic solution of tylenol was 2.0, what would its concentration be?
Compound A absorbs at 268 nm, B at 278 nm, and C at 316 nm. What might you conclude about the structures of these three compounds?
How can the relative scarcity of drugs that fluorescence be an advantage in some instances and a disadvantage in others? Why is UV/visible spectrophotometry most often used for screening rather than f
When 2.50 g of copper (Cu) reacts with oxygen, the copper oxide product has a mass of 2.81g what is the simplest formula for the copper oxide?
How many lines can be seen in the absorption spectrum and what aretheir energies? Provide me with an explanation of what are the selection rules about.
The broad features of the spectrum are thereforeexpected to resemble those of hydrogen, the differences arising largely from the mass relations. At which energy will the first three lines of the B
Calculate the form of the Zeeman Effect, which occurs when a homogeneous magnetic field of4.0 T (40 kG) is applied to a hydrogen atom in which the transition from the 2p- to the 3d-state is monitore
According to Boyle's Law, if the temperature of a confined gas is held fixed, then the product of the pressure P and the volume V is a constant. Suppose that, for a certain gas, PV = 800, where P is
Discuss two ways in which sodium thiosulphate synthesis can be used in reactions. chemical equations are necessary.
The enthalpy of vaporization of carbon tetrachloride is +30.0 kJ/mol at its normal boiling temperature of 80.7 K. Calculate the vapor pressure at 100 K.