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4.3 g of Sample D (molar mass = 82.5 g/mol) is combusted in a coffee cup calorimeter. 120 mL of H2O at 23.4°C increases to 28.9°C. What is the enthalpy change for the reaction of D in J/g?
Calculate the molality H3PO4 in the solution and Water is the solvent and the molarity of H3PO4 in the solution and the number of ml of the 85% H3PO4 that is required to make 800 ml of 2.00 M H3PO4?
A 0.1000 m aqueous solution of a weak acid, HA, is 1.5% ionized. At what temperature does it freeze? Kf for water = 1.86°C/m.
The mass of 322 mL of hydrogen gas at 4.0 atm and -73°C is 1.21 grams. What is the density of hydrogen gas at STP?
Sketch a molecule of Pbr3Cl2 in which the chlorines are in axial position position. Sketch another molecules of Pbr3Cl2 in which the chlorines are equatorials positions.
Find the molarity of a solution prepared by dissolving 120 g CaCl2 (MW = 111 g/mol) in 450 cm3 of solution.
The Coal is fed with 200% excess water ( excess is calculated with respect to CO formation) 100% of coal is consumed. the selectivity to CO (with respect to CO2) is 1:1 the functional conversion of the CO is 50% what is the final gas composition. ..
Chemical Kinetics - Show that only the reactants of the slow step of a reaction are found in the rate law of the reaction - which of the two steps is slower and which substance (if any) is probably an unstable intermediate?
how would each of the following change the rate of the reaction shown here? 2NO(g) + 2H2(g) > N2(g) + 2H2O(g)? a)adding NO(g). b)lowering the temperature. c)removing some H2(g) d)adding a catalyst
Place the following in order of increasing strength as reducing agents (all under standard conditions). (Use the appropriate symbol to separate substances in the list.) Cr3+, H2, Zn, Li, F -, Fe2+
CH3OH(g)-> CO(g) + 2 H2(g) H = +90.7 kJ Calculate E when 335.0 g of CH3OH(g) completely reacts at a constant temperature of 300 K and constant pressure of 0.95 atm. R = 8.314 J/mol*K and R = 0.08206 atm*L/mol*K
The value of Kf for cyclohexane is 20.0°C/m, and its normal freezing point is 6.6°C. A mass of 1.604 g of a waxy solid dissolved in 10.000 g of cyclohexane results in a freezing point of 4.4°C. Calculate the molar mass of the solid.
Calculate the reversible potential difference between the two wires when the activity of dissolved zinc chloride is 0.01 molal (mol/kg H20). Indicate the direction of the spontaneous reaction and the sign of the electrodes.
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