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Calculate the moles of calcium carbonate present in a 25.00 mL sample of standard, assuming the standard is known to have a hardness of 95.4 ppm (hardness due to CaCO3).
The atomic mass of copper is 63.546 amu the masses of the isotopes of the naturally occurring isotopes of copper are 62.9298amu for (63)Cu and 64.9278amu for (64)Cu. Calculate the percent abundance
How many milliliters of concentrated hydrochloric acid solution 36.0% HCl by mass, density = 1.18 g/mL are required to produce 20.0 L of a solution that has a pH of 2.16?
If the maximum temperature achieved was -36°C at 53,3 KPa, what percentage of the final volume was the initial volume if the balloon was totally expanded ?
The acid-dissociation constant for hypochlorous acid HClO is 3.0 x 10^- 8. Calculate the concentration of H3O^ + at equilibrium if the initial concentration of HClO is 7.5×10^-3 M.
When CO2 is bubbled through an ether solution of benzyl magnesium bromide, and the resulting mixture is acidified, phenyl acetic acid is produced. Any unreacted benzyl magnesium is converted to tolu
Why is benzyne such a reactive molecule/why is it so unstable? (Is there any reason other than the fact that triple bonds are not stable within a 6-membered ring?)
If acetic acid is the only acid that vinegar contains Ka = 1.8 x 10^- 5, calculate the concentration of acetic acid in the vinegar. The pH is 3.15.
How does the presence of impurity B affect the solubility behavior of solute A? Do the solubilities of the two substances add together? Can each of them be treated separately?
Consider the combustion of ethylene, C2H4(g) + 3O2(g) ----> 2CO2(g) + 2H2O(g). If the concentration of C2H4 is decreasing at the rate of 0.025 M/s, what are the rates of changes in the concentra
LNG (Liquefied Natural Gas) is essentially methane gas cooled to -160 C at which temperature it condenses to the liquid state at a few psia above atmospheric.
We now raise the temperature of the cylinder very slowly, causing the air to expand raising the piston. What is the temperature just before the piston reaches the top of the cylinder?
In a car engine, gasoline (represented C8H18) does not burn completely, and some CO, a toxic pollutant, forms along with CO2 and H2O. If 5.0% of the gasoline forms CO:
The experiment is tried with two initial temperatures (a) 0 C and (b) 100 C. Calculate q, w, Delta U, Delta H and Delta Ssys and Delta Ssurr, Delta Suniv for the two expansions . Can you account for
When methane () burns, it reacts with oxygen gas to produce carbon dioxide and water. What mass of carbon dioxide is produced from the complete combustion of 8.40×10-3 g of methane?
The oxygen atom of water pulls electron strength from the hydrogen atoms toward itself, leaving it with a partial positive charge and the hydrogen atoms with partial negative charges.
After the reaction was complete, the solid residue (consisting of MgO and the original impurities) had a mass of 18.7693 g. Assum- ing that only the magnesium carbonate had decomposed, how much magn
The barrier to C-C bond rotation in bromoethane is 15 kJ/mol. What energy can you assign to an H-Br eclipsing interaction?
The energy from radiation can be used to cause the rupture of chemical bonds. A minimum energy of 941 is required to break the nitrogen-nitrogen bond in N2.
An aerated lagoon with a liquid volume of 3000 m3 is designed to accommodate an inlet flow rate of 105 L/min. BOD (biological oxygen demand) is a non-conservative pollutant that is of key importance
Calculate the molar amounts of the overhead and bottoms products, the mole fraction of benzene in the bottoms product, and the percentage recovery of toluene in the bottoms product.
Calculate the amount of heat (kcal) released when 50.0 g of steam at 100 degrees celsius hits the skin, condenses, and cools to a body temperature of 37 degrees celsius.
Phenylacetic acid C6H5CH2COOH is one of the substances that accumulates in the blood of people with phenylketonuria, an inherited disorder that can cause mental retardation or even death.
If a hydrate of the formula decomposes when heated to produce HCl, what change would you expect to occur when a piece of blue litmus paper is held in the path of the vapor released?
Copper was first heated up in a crucible with sulfur to form copper sulfide. So if there is enough oxygen present to form copper (II) oxide, will CuS break apart to form copper oxide in the present