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The following reaction was performed in a sealed vessel at 742 degrees celcius : H2(g)+I2(g)->2HI(g) Initially, only H2 and I2 were present at concentrations of [H2]=3.45M and [I2]=2.95M . The equilibrium concentration of I2 is 0.0900M. What is the equilibrium constant, Kc , for the reaction at this temperature?
A piece of sodium metal reacts completely with water as follows. 2 Na(s) + 2 H2O(l) 2 NaOH(aq) + H2(g) The hydrogen gas generated is collected over water
Calculate the number of millimoles of HCl needed to reach the methyl orange end point. b. How many millimoles of Na2CO3 reacted with the HCl?
An arctic weather balloon is filled with of helium gas inside a prep shed. The temperature inside the shed is . The balloon is then taken outside, where the temperature is . Calculate the new volume of the balloon.
Fluorine reacts with oxygen to yield oxygen difluoride. 2 F2(g) + O2(g) 2 OF2(g) What is the value of K if the following concentrations are found at equilibrium: [O2] = 0.200 mol/L, [F2] = 0.0100 mol/L, and [OF2] = 0.0633 mol/L.
a solution is prepared by adding 40.3 g of Mg(NO3)2 to 127 g of water. Calculate the mole fraction and molality of magnesium nitrate in this solution
Reduction of Conjugated Ketones with Sodium Borohydride, Suggest mechanisms of reaction for 1,2-addition and for conjugate addition (1,4-addition) of NaBH4 to a conjugated
If 4.00 g of the unknown compound contained 0.133 mol of and 0.267 mol of H , how many moles of oxygen, O , were in the sample?
How much heat is lost when a 640 g piece of copper cools from 375 oC, to 26 oC? (The specific heat of copper is 0.387 J/g . oC)
A box contains a mixture of small copper spheres and small lead spheres. The total volume of both metals is measured by the displacement of water to be 432 cm^3 and the total mass is 4.32 kg
A student calibrates his/her calorimeter. S/he performs part 1 as instructed. The data are: 99.4 g water at 36.0°C are added to 98.0 g water in the calorimeter at 16.0°C.
How much heat is required to raise the temperature of a 7.40-g sample of iron (specific heat = 0.450) from 25C to 79.8C?
Calculate the change in temperature for 4.5g of CaCl2 dissolved in 90.0mL of H20. Assume that calorimeter absorbs no heat. (Ccal=0)
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