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A 0.4243-g sample of CaCO 3 is dissolved in 12 M HCl and the resulting solution is diluted to 250.0 mL in a volumetric flask.How many moles of CaCO 3 are used (formula mass = 1 00.1 )?
A 70 piece of ice at 0 is added to a sample of water at 6. All of the ice melts and the temperature of the water decreases to 0. How many grams of water were in the sample?
An unknown compound has a melting point of 121 - 122 °C. Melting point of a mixture of pure benzoic acid and your unknown sample was 116-122 °C. Melting point of a mixture of 2-naphthol and your unknown sample was 110 - 116 °C. What is your unknow..
The heat of solution of ammonium chloride is 15.2 kJ/mol. If a 6.323 g sample of NH4Cl is added to 65.0 mL of water in a calorimeter at 24.5°C, what is the minimum temperature reached by the solution?
The ice was poured out into another container leaving a wet, empty beaker that weighed 46.146g. How much ice was poured into the other container?
A sample of 0.0020 mole of HCl is dissolved in water to make a 2000mL solution. Calculate the molarity of the HCl solution, the {H3O}, and the pH.
the air in the laboratory was measured with a barometer to be 7.20 x 10 squared mm Hg. what is the laboratory air pressure in atm.
It is produced natrually from degradation of organic matter, and also anthropogenically from fuel combustion.) The acid dissociation constant, Ka for formic acid is 10-3.7. Assume T=4*C and I=0.
Addition to double bonds, oxidation of double bonds - Draw the structure/structures for the major organic product/products formed when 1-methylcyclohexene reacts
You have 500.0 mL of a buffer solution containing 0.20 M acetic acid (CH3COOH) and 0.30 M sodium acetate (CH3COONa). What will the pH of this solution be after the addition of 20.0 mL of 1.00 M NaOH solution? [Ka = 1.8 ´ 10-5]
Find the partial pressure and concentration of Nitrogen, Oxygen, and Carbon dioxide.
A certain substance has a heat of vaporization of 37.43 kJ/mol. At what Kelvin temperature will the vapor pressure be 7.00 times higher than
Calculate the pKa of the second ionizable group of Z.
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