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1. Gypsum is a mineral, or natural substance that is a hydrate of calcium sulfate CaSO4. A 1.000g sample of gypsum contains 0.791g of CaSO4. How many moles of CaSO4 are there in this sample. Assuming that the rest of the sample is water, how many moles of H2O are there in the sample?
2. A 1.547g sample of blue copper (II) sulfate pentahydrate CuSO4~5H2O is heated carefully to drive off the water. They white crystals of CuSO4 that are left behind have a mass of 0.989g. How many moles of H2O were in the original sample?
Phosphorus pentachloride decomposes to phosphorus trichloride and chlorine gas at elevated temperatures by the following reaction: PCl5(g) PCl3(g) + Cl2(g). If Kc = 1.8 at 250°C, what is the value of Kp at the same temperature
How much heat (kJ) is absorbed/ released? b. What is the change in internal energy (kJ) if the reaction results in a volume change of - 2.78 L?
Problem- Sketch the 19F NMR and 119Sn (only for SnF4) spectra for the following species in solution: [SF5]- C/F3 SnF4 Nuclear spins (and abundances): 19F I=1/2 (100%); 119Sn I=1/2 (8.6%). All other nuclei are NMR inactive.
Oxygen gas reacts with powdered aluminum according to the following reaction: 4Al(s) + 3O2 (g) = 2Al2O3(s). How many liters of O2 gas, measured at 779 mm Hg and 30 C, are required to completely react with 2.5 mol of Al?
Butane(C4H10) is used as a fuel where natural gas is not avaiable. How many grams of butane will fill a 45.0 liter container at 27 degrees celsius and 3.05atm
Calculate the standard entropy, ΔS°rxn, of the following reaction at 25.0°C using the data in this table. The standard enthalpy of the reaction, ΔH°rxn, is -633.1 kJ·mol-1.
Question- A 2.580 gram sample containing an unknown amount of arsenic trichloride and the rest inerts was dissolved into a NaHCO3 and HCl aqueous solution. To this solution was added 1.980 grams of KI and 50.00 mL of a 0.00905 M KIO3 solution.
Problem- What mass of NH4Cl will be required to prepare 1.0 L of a buffer solution at pH 9.50 containing 68.00 mL of NH3 (aq) ( ? = 0.90 g.cm-3 ; 28 % w/w) which pKB is 4.75?
Products is second order with a rate constant of 0.469 M-1s-1. If the initial concentration of A is 0.159 M, how many seconds would it take for the concentration of A to decrease to 5.12 * 10-3 mol/L?
The following reaction is exothermic (H= -226 kJ) and has a rate law: Rate = k(NO2)^2: NO2 + CO ? NO (g) + CO2 (g) for each of the following disturbances, indicate whether the rate of the reaction will be FASTER or SLOWER and indicate whether ther..
What is the lone pair?
How much potassium nitrate has to dissolve in water to absorb 110 of heat?
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