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What is the pressure in atmospheres in a 50.0L balloon at 25?C filled pure hydrogen gas produced by the reaction of 45.9g of CaH2 with water? ( show all work) CaH2 + H2O ---> Ca(OH)2 + H2 (unbalanced)
Combustion reactions are exothermic. The heat of reaction for the combustion of butane, C4H10, is 687.8 kcal/mol. What is the heat of combustion for butane in kcal/gram?
A solution is prepared by dissolving 11.60g of a mixture of sodium carbonate and sodium bicarbonate in 1.00 L of water. A 300.0-cm^3 sample of the solution is then treated with excess HNO3 and boiled to remove all the dissolved gas.
What is the airborne radioactivity concentration? Using 10 CFR 20, if the particles are composed of cobalt oxide, how many DAC does this represent?
How many moles of NiCl can be formed in the reaction of 5.00 mol of Ni and 10.0 mol of HCl
Thyroxine, an important hormone that controls the rate of metabolism in the body, can be isolated from the thyroid gland. If 0.455 g of thyroxine is dissolved in 10.0g of benzene, the freezing point of the solution is 5.144 degrees celcius.
A 5.00 % m/m glucose solution has d = 1.02 g/mL. What is the mass of glucose in 362 mL of the solution.
A sample of hydrogen gas at a pressure of 1.07 atm and a temperature of 296oC, occupies a volume of 682 mL. If the gas is cooled at constant pressure until its volume is 572 mL, the temperature of the gas sample will be
A buffer is made by dissolving 0.037 mol of potassium fluoride in 135 mL of 0.0237M hydrofluoric acid. Assume no volume change when the salt is dissolved. Calculate the pH of the buffer.
a) Write the next ionic equations for the precipitation reaction or reactions that occur. b) What are the spectator ions in the solution?
Some wastewater has a BOD5 of 150 mg/L. The reaction rate is 0.23/d. What is the ultimate carbonaceous BOD
Why is acceptable to use a mixture of the alpha and beta anomers of D-(+)-mannose in this reaction? (i.e. why isn't it necessary to use either a pure alpha or the pure beta anomer? 2. What is the role of ferric chloride?
Calculate K for 2 NO(g) + O2(g) 2 NO2(g) from the observation that when equilibrium is established at 500 K, there are 0.190 moles NO2, 2.65 X 10-4 moles NO, and 0.606 moles O2 in a volume of 0.759 liters.
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