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Calculate the molality of the unknown compound (m). m=mol of solute X particles per formation / mass of solvent , kg Data given: Mass of test tube , flask, t-butyl alcohol and unknown : 146 .42g Mass of test tube and flask: 139.53g Mass of t-butyl alcohol , test tube , and flask : 146:24g Mass of t-butyl alcohol : 6.71 g Mass of unknown : 0.18g Freezing Point of solution from cooling point: 29.3 C Freezing point depression caused by addition of the unknown to t-butyl alcohol.: -5.00C
Compute the final temperature of the mixture (assuming no heat loss to the surroundings). The heat capacities of H2O(s) and H2O (l) are 2.08 and 4.18 J/g · °C, respectively, enthalpy of fusion for ice = 6.02 kJ/mol.
How much energy is required to boil 45.5g of water at 100 degrees C at sea level? The molar heat of vaporization of water is 40.6 kJ/mol.
The mass of an electron is 9.11 times 10^{-31}kg. If the de Broglie wavelength for an electron in a hydrogen atom is 3.31times 10^{-10} how fast is the electron moving relative to the speed of light? The speed of light is 3.0 times10^8 m/s.
How many grams of cisplatin are formed from 54.4g of K2PtCl4 and 36.4g of NH3 if the reaction takes place in 95% yield based on the limiting reactant.
A 2.914-g sample of gypsum, a hydrated salt of calcium sulfate, CaSO4, is heated at a temperature greater than 170 Celsius in a crucible until a constant mass is reached.
Molecular formula of a compound and Deduce from these data the corresponding equation and write formulas for the oxide and sulfate of M .
How many moles of excess base are present? How many additional mL of 0.100 M HCl would be required to neutralize the solution?
The rate of a chemical reaction can sometimes be determined by measuring the change in mass of the reaction flask and its contents with time
What is the pH of a solution that has a formic acid (HCHO2) concentration of 0.39 and a potassium formate (KCHO2) concentration of 0.12? The Ka for formic acid is 1.7 x 10-4.
The solubility product of Mg(OH)2 is 1.2E-11. What minimum OH- concentration must be attained (for example, by adding NaOH) to decrease the Mg2+ concentration in a solution of Mg(NO3)2 to less than 1.9E-10 M?
The melting point of water is 0.000C at 1 atmosphere. If 11.64 grams of chromium(II) acetate, (170.1 g/mol), are dissolved in 287.2 grams of water .what is the molarity?
When 25mL of a 120mL stock solution containing 2M AlCl3 is diluted to 80mL, how many moles of Al3+ are in the new solution.
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