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A calorimeter contains 27.0 mL of water at 11.0 C. When 2.10 g of X (a substance with a molar mass of 74.0 g/mol) is added, it dissolves via the reaction X{(s)}+H_2O{(l)} -> X{(aq)} and the temperature of the solution increases to 30.0C. Calculate the enthalpy change, Delta H, for this reaction per mole of X. Assume that the specific heat and density of the resulting solution are equal to those of water [4.18 J/(g .C}) and 1.00 g/mL] and that no heat is lost to the calorimeter itself, nor to the surroundings
A gas mixture being used to simulate the atmosphere of another planet consists of 324 mg of methane, 217 mg of argon, and 228 mg of nitrogen.
Equal masses of water and ethylene glycol are mixed. What is the concentration of ethylene glycol in units of molality? The molar mass of water and ethylene glycol are 18.02 g/mol and 62.07 g/mol, respectively.
A piston has an external pressure of 11.0 bar . How much work has been done if the cylinder goes from a volume of 0.150 liters to 0.570 liters.
Metal X was plated from a solution containing cations of X. The passage of 48.25 C deposited 31 mg of X on the cathode. What is the mass of X (in grams) per mole of electrons.
In a calorimeter, 10 g of ice absorbs heat with an enthalpy of fusion of 334 J/g. What is the heat absorbed.
Calculate the number of grams of H2 formed If the wet Hydrogen gas formed occupies a volume of 9.67 Litres
Determine the number of significant digits in each number and write out the specific significant digits.
Calculate the empirical formula, Molecular weight, and molecular formula of the compound when an organic compound has C=55.8% and H=7.03%. A 1.500g sample was vaporized collected over H2O and found to occupy 0.500L at 100C and 764 mmHg. (vapor pre..
What is the work in kilojoules done during a synthesis of ammonia in which the volume contracts from 7.0 L to 4.3L at a constant external pressure of 47 atm?
A gaseous mixture of O2 and N2 contains 36.8% nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 685 mmHg.
A sample of gas has a density of 1.25 g/dm at 30 degrees C and 1.02x10^5 Pa. What is the molecular mas of this gas?
volume of 20.0 mL of a 0.190 M HNO3 solution is titrated with 0.550 M KOH. Calculate the volume of KOH required to reach the equivalence point.
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