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The standard free energy change for the formation of N2H4(l) from elements is +149 kJ/mol at 25 °C. What is the equilibrium constant for the reaction? (R = 8.314 J/K·mol)
What is the standard cell potential of a Cr-Hg cell? (Remember to switch one-half reaction to oxidation and to balance the number of electrons--use paper.)
If 43 g of hot water at 85°C is poured into a cavity in a very large block of ice at 0°C, what will be the final temperature of the water in the cavity?
A first-stage recovery of magnesium from seawater is precipitation of Mg(OH)2 with CaO: What mass of CaO, in grams, is needed to precipitate 1000lb of Mg(OH)2?
Calculate the standard cell potential (E^circ) for the reaction rm X {(s)}+ rm Y^{+}{(aq)} rightarrow rm X^{+}{(aq)}+ rm Y {(s)}
A quantity of N2 originally held at 3.80 atm in a 1.00L container at 26oC is transferred to a 10.0L container at 20oC. A quantity of O2(g is originally at 4.75 atm and 26oC in a 5.00L container is t
Which of the following alkenes can exhibit cistrans isomerism?
A mixture containing 3.9 mole of NO and 0.88 mole of CO2 was allowed to react in a flask at a certain temperature according to the following equation
A toy train is pushed forward and released at = 2.0 with a speed of 1.5 . It rolls at a steady speed for 2.8 , then one wheel begins to stick. The train comes to a stop 5.6 from the point at which i
What is the molarity (M) of a solution that contains 2.08 grams of NaOH (MM = 40.00 g/mol) in 79.65 mL of solution?
Draw the skeletal structure of one of the enantiomers (that means you have to show wedge/dash bond(s)) formed when (Z)-3-methyl-2-pentene reacts with Br2 in the presence of water.
Consider the following equilibrium: Ag+(aq)+Cl-(aq)<-->AgCl(s). Use Le Chatelier's principle to predict how the amount of solid silver chloride will change when the equilibrium is disturbed by
2C4H10 + 13O2 → 8CO2 + 10H2O. How many moles of O2 are needed to react with 3.75 moles of C4H10?
What is the molar solubility of NiS in 0.10 M NH3?
Estimate the value of the equilibrium constant at 610K for each of the following reactions delta H and delta S for BrCl(g) is 14.6 kj=J/mol and 240 J/(mol*K) respectively
The coefficients of static and kinetic friction between a 67 kg box and a horizontal surface are 0.56 and 0.32, respectively.
A skydiver weighing lb (including equipment) falls vertically downward from an altitude of ft and opens the parachute after s of free fall. Assume that the force of air resistance is when the parach
The canister is placed in an oven until all the has boiled off and the canister is empty. How much energy in calories was absorbed?
A 15 g bullet traveling at 485 m/s strikes a 0.9 kg block of wood that is balanced on a table edge 0.7 m above ground. If the bullet buries itself in the block, find the distance D at which the blo
An ethylene glycol solution contain 21.2g ethylene glycol (C2H6O2) in 85.4ml of water. Compute the freezing point and boiling point of the solution. (Assume the density of the water was 1.00g/ml
Is it safe to assume that if they are both R- or both S- that they are identical? or is it possible for both to be R but still be chiral?
The block, of mass 1.14 kg, is subject to no horizontal external forces during the collision with the bullet. After the collision, the block is observed to move at a speed of 4.50 m/s. How much kin
Calculate the pH of the solute in an aque- ous solution of 0.611 M NH3(aq) if the Kb is 1.8 × 10-5. What is the percentage protonation of the solute? Answer in units of % & ;
The oxide of 'N' element contains 33.33% of the element .The same element forms a chloride whose Vapour density is 59.25. Calculate equivalent weight , atomic weight and valency of the element ?
A car travels due east with a speed of 45.0 km/h. Raindrops are falling at a constant speed vertically with respect to the Earth. The traces of the rain on the side windows of the car make an angle