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A mixture of CaCO3 and CaO weighing 0.635 g was heated to produce gaseous CO2. After heating, the remaining solid weighed 0.427 g. Assuming all the CaCO3 broke down to CaO and CO2, calculate the mass percent of CaCO3 in the original mixture.
Using the equation Fe2O3+2Al-->2Fe+Al2O3, how many grams of Al are needed to completely react with 135 g Fe2O3
Hexane has a density of 0.659 g/mL. How many milliliters would a student need to pour in order to get 49.5 g of hexane?
Dilute solutions of sodium chloride(NaCl), Sodium sulfate(Na 2 SO 4 ), and Sodium sulfide (Na2S) are available to separate the positive ions from each other., in which order the solutions should be added In order to effect separation?
A compound contains 40.00% carbon, 6.67% hydrogen, and 53.33% oxygen. Determine the empirical formula of the compound. Give the chemical formula for calcium phosphate.
Calculate the Calorimeter Constant if 25 g of water at 50 C was added to 25 g of water at 25C with a resulting temperature of 35 C?
What is the pH of the solution which results from mixing 25 mL of 0.30 M HF(aq) and 25 mL of 0.30 M NaOH(aq) at 25 ºC? (Ka of HF = .00072)
Sn2 requires a strong nucleophile while E2 requires a strong base. But relatively compared if you have a very strong base the E2 is preferred. Why is it so?
If 2 x 10-4 moles of S2O82- in 50 mL solution are consumed in 188 seconds, what is the rate of consumption of S2O82-
Calculate the number of moles of KHP? b. How many moles of NaOH will react with the KHP dissolved in water? c. Calculate the Molarity of the NaOH solution?
What is the mole fraction of ethanol in a solution made by dissolving 14.6 g of ethanol in 53.6 g of water?
A solution of malonic acid, H2C3H2O4 was standardized by titration w.1000M NaOH solution. If 20.76 mL of the NaOH solution were required to neutralize completely 13.15 mL of the malonic acid solution
An Ice cube tray holds 325 grams of water. If the water initially has a temperature of 25 C, how many kilojoules of heat must be removed to cool and freeze the water 0 C?
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