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A 100 mL stock solution contains 4.1 M Na3PO4. When 31 mL of the stock solution is diluted to 73 mL, how many moles of Na+ ions will be contained in the dilute solution?
An experiment shows that a 250 mL gas sample has a mass of 0.430 g at a pressure of 728 mmHg and a temperature of 26 C. What is the molar mass of the gas?
If 26.9 mL of base are required to neutralize 20.5 mL of the acid, what is the molarity of the hydroiodic acid solution?
A mixture of .148 moles of C is reacted with .117 moles of O2 in a sealed 10L container at 500K producing CO and CO2. The total pressure is .640 atm. What is the partial pressure of CO?
Identify each of the following as an acid or base and write a chemical equation showing how it is an acid or a base according to the Arrhenius definition?
Lakes that have been acidified by acid rain can be neutralized by liming, the addition of limestone (CaCO3). How much limestone (in kg) is required to completely neutralize a 4.3 billion liter lake
Commercial concentrated aqueous ammonia is 28% by mass and has a density of 0.90. What is the molarity of this solution?
Greg Nard added an equivalent of 3,4-epoxy-4-methylcyclohexanol to an ether solution of methyl magnesium bromide and then added dilute hydrochloric acid. He expected that the product would be a diol
Assuming the diver took a deep breath (6.0L in her lungs) at 1.0 atm just before entering the water, what will be the volume of air in her lungs when she gets to 10 feet of depth? She does not exhal
A football is inflated to a pressure of 1.00 x 10^3 torr in a room at 25 degrees C. If the game is played at 10 degrees C, what will the pressure in the ball be, neglecting any volume change in the
Jerry forgot to record the actual molar concentration of the standard HCL solution (which was actually 0.044M), However to complete the calculations quickly the 0.05 M concentration was used.
If the heat change for the decomposition of 25.0 g hydrogen peroxide is -72.2 kJ, what is the enthalpy of reaction for the process with respect to moles of hydrogen peroxide?
An aqueous solution of sodium hydroxide is labeled .010 M NaOH. What are the molar concentrations of NaOH, Na+ and OH- in the aqueous solution?
At 100 atm the melting temp changes to 351.26 K. Calculate the enthalpy and entropy of fusion of the solid.
The difference in chemical potential between two regions of a system is +7.1 kJ/mol. By how much does the Gibbs free energy change when .10 mmol of a substance is transferred from one region to the
The gas in a piston (defined as the system) is warmed and absorbs 670 J of heat. The expansion performs 347 J of work on the surroundings. What is the Change in internal energy for the system?
If you start with 3.50g of aluminum, 1.5mL of 1.4M potassium hydroxide and 25.0mL of 9M sulfuric acid (with excess water), what is the limiting reactant? What is the theoretical yield of hydrated al
The specific heat of copper metal is 0.385 J/g ·°C. How many joules of heat are necessary to raise the temperature of a 1.40 g block of copper from 31.4°C to 96.6°C?
Calculate the equilibrium partial pressures of NO2, O2, and NO3 produced from an initial mixture in which PNO2 = PO2=0.40 atm and PNO3=0. (Hint: Use the method of successive approximations to solve.)
A 2.70 mole quantit of NOCl was initially in a 1.50 L reaction chamber at 400°C. After equilibrium was established, it was found that 22.0 percent of the NOCl had dissociated:Calculate the equil
Calculate the perimeter and area of the figure. Show all work and give the perimeter and area using the correct units. Find the perimeter and area of a circle with a radius of 4 ft
Suppose 100.0 mL of a 0.03750 M solution of the strong base Ba(OH)2 is titrated with a 0.4540M solution of the strong acid HClO4. The neutralization reaction is:Compute the pH of the titration solut
0.65g of hydrogen chloride (HCl) is dissolved in water to make 8.0L of solution. What is the of the resulting hydrochloric acid solution?
What is the pH of the original buffer after the addition of 0.10 mol of hydroiodic acid ?
The venom of biting ants contains formic acid, HCOOH (Ka=1.80*10^-4 at 25 C). What is the pH of a 0.0065 M solution of formic acid?