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an empty gasoline can with dimensions 19 cm by 47.7 cm by 13.0 cm is attached to a vacuum pump and evacuated. if the atmospheric pressure is 14.7 lb/in^2, what is the total force in pounds on the ou
In the course of a titration of barium ion in a sample by sulfate ion in a titration solution, 83.5mL of the .200 M Na2SO4 was required to precipitate all the barium ions. How many grams will the dr
Assuming constant specific heats for the air at room temperature, determine the average temperature of the air in 30 min. Assume the air pressure in the room is constant at 100 kPa
An "empty" gasoline can with dimensions 19.4 cm by 35.8 cm by 12.0 cm is attached to a vacuum pump and evacuated. If the atmospheric pressure is 14.7 lb/in2, what is the total force (in pounds) on t
A certain brine has 3.88% NaCl by mass. A 75.0-mL sample weighs 77.0g .How many liters of this solution should be evaporated to dryness to obtain 725kg NaCl?
How many grams of H3PO4 can be formed from 2.65 mol P4O10? Assume an excess of water.
Baking soda is sodium bicarbonate (NaHCO3). When you heat baking soda, it breaks down into sodium carbonate powder (Na2CO3), water vapor, and carbon dioxide. The enthalpy of this reaction is 129 kJ.
A sample of 30.0 mL of Krypton gas, Kr, is at 756 mmHg and 25°C. What is the new volume if the pressure is decreased to 325 mmHg and the temperature is decreased to -125°C.
When pure carbon is burnt in air some of it is oxidized to CO2 and some to CO. If the molar ratio of N2 to O2 is 7.18 and the molar ratio of CO to CO2 is 2, what is the percentage excess air used? E
The dipole moment and bond distance measured for the highly reactive gas phase OH molecule are 1.78D and 0.98Ao, respectively. Calculate the effective charges on the H and O atoms of the OH molecule
what volume of 0.200M hcl must be added to 250mL of 0.300M sodium mandelate to produce a buffer of solution with a pH of 3.37?
What is the pH change of a 0.270M solution of citric acid (pKa=4.77) if citrate is added to a concentration of 0.145M with no change in volume?
A 100.0 mL sample of 0.10 M NH3 is titrated with 0.10 M HNO3. Determine the pH of the solution before the addition of any HNO3. The Kb of NH3 is 1.8 × 10-5.
Calculate the boiling point elevation of a solution containing 37.5 g of glucose (C6H12O6) dissolved in 408.6 g of water. Calculate the freezing point depression for the same solution.
zinc metal reacts with hydrochloric acid (HCI to produce zinc chloride and hydrogen gas. how many moles of HCI are needed to react with 2.30 moles of Zn
The Vitamin C tablet changed color at 23.7 mLs of Iodine. how do you find out how much vitamin c is in the tablet?
.A sample of an ionic compound that is often used as a dough conditioner is analyzed and found to contain 7.591 g of potassium, 15.514 g of bromine, and 9.319 g of oxygen. What is the empirical form
A throat lozenge contains 5.0 mg of menthol, which has the formula C10H20O. How many moles of menthol are in 5.0 mg of menthol?
A student back-titrated the excess HCl with 41.53 milliliters of 0.365 M NaOH solution to a blue endpoint with bromophenol blue. How many moles of NaOH were added during the back titration?
If the anode compartment contains [SO2-4]= 1.50M in equilibrium with PbSO4(s), what is the Ksp of PbSO4?
Calculate the concentration of NH3(aq) necessary to initiate the precipitation of Zn(OH)2 from a 0.0010 M ZnSO4 solution. The Ksp for Zn(OH)2 is 1.8 x 10-14. The Kb for NH3 is 1.8 x 10-5.
25.0 mL of a hydrofluoric acid solution of unknown concentration is titrated with 0.200 M NaOH. After 20.0 mL of the base solution has been added, the pH in the titration flask is 3.00. What was the
A NASA satellite showed that in 2003 the ozone hole was much larger than it was in 2002. The 2003 hole measured 1.04 × 107 mi2 in diameter, while the diameter of the 2002 hole was 6.9 ×
A 1M solution of Cu(NO3)2 is placed in a beaker with a strip of Cu metal. A 1 M solution of SnSO4 is placed in a second beaker with a strip of Sn metal. A salt bridge connects the two beakers, and w
What is the volume of concentrated sulfuric acid needed to prepare a 500 mL solution of 2.0 N sulfuric acid (H 2SO 4).The information written on the concentrated sulfuric acid bottle are as fo