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1. Butane, C4H10 can be burned in oxygen gas according to the reaction below. 2C4H10 (g) + 13O2 (g) ???? 8CO2 (g) + 10H2O (v) a) How many moles of carbon dioxide are produced when 6.8 moles of butane are completely burned? .................... _________________ b) Assuming complete combustion, what mass of water would be produced from 75.0 mol of oxygen? .................... _________________ c) How many moles of oxygen would be required to produce 1.561 kg of pure carbon dioxide gas at STP?........................ _________________ d) If 6.8 moles of propane (C3H8) were burned what minimum mass of oxygen gas would be required for complete combustion. You must write a balanced chemical equation similar to that found on the top of this page to solve this question. (5) BONUS: What mass of water could be formed from 75 g of oxygen and 75 kg of propane. 2. In the reaction for question 1 above, a tank contained a mixture of butane and non reactive krypton. The two gases together had a mass of 805 g. When completely burned, 1.35 kg of carbon dioxide was produced. Determine the percent by mass krypton in the mixture. (10) 3. Consider the following reaction: 2 Al + 3 I2 ------> 2 Al(I)3 a) Determine the limiting reagent and the theoretical yield of the product in grams if one starts with 1.20 mol Al and 2.40 mol iodine. (4) b) Determine the theoretical yield of the product in grams if one starts with 1.20 g Al and 2.40 g iodine. How many grams of Al are left over in part b? (6) 8. In the thermite reaction aluminum reacts with rust quite dramatically. The reaction is : 2 Al + Fe2O3 = 2 Fe + Al2O3. a) If 10 g each of Al and Fe2O3 are used how much Fe should be produced when the limiting reactant is exhausted? (8) b) What is the percent by mass yield of iron if only 3.0 g of iron is recovered from the original 10 g of iron (iii) oxide? (2) 9. TNAZ is a dense (1.832 g/cm3) explosive with the proper name 1,3,3-trinitroazetidine, C3H4N4O6, often just abbreviated as "TNAZ". When TNAZ detonates, it produces only carbon dioxide, carbon monoxide, water and nitrogen, all in the gaseous state. Like most pure substances that are explosive, the TNAZ molecule contains all of the oxygen it needs for the detonation reaction, so no reactants other than the solid explosive are involved (it can explode in outer space!). a) Given this information, write a balanced chemical reaction for the detonation of TNAZ. Hint: just use some (small number) coefficients on the product side of the reaction. b) What is the molar mass of TNAZ? c) The "oxygen balance" is an important property of explosives. What is the percent by mass of oxygen in a sample of TNAZ? d) How many moles of TNAZ are there in a sample of the material that has a volume of 1.00 cm3? e) If a 1.00 cm3 sample of TNAZ is detonated, how many grams of CO2 are produced? (4) f) What mass of TNAZ would have to be detonated to produce 175 g of water vapor? What if only 137 g of H2O was produced-what would be the percent yield of the reaction? (6)
The de Broglie wavelentgh of an electron is 8.7 x 10^-11m. The mass of this electron is 9.1 x 10^31 kg. What is the velociy in m/s of this electron (h = 6.63 x 10^-34 J-s)
How many molecules would be contained in each of the following at the same temperature and pressure. A.) 5.0 L hydrogen
Assuming a quantum requirement for photosynthesis of 8 (8 photons), calculate a thermodynamic efficiency in percent under standard conditions for the conversion of carbon dioxide to 3-phosphogylcerate if the wavelength of light used in 400 nm.
State the organic products of each of the subsequent reactions show the structures of the reactants as well as products. If two stereoisomers are produced, depict both and label all sterogenic centers R or S as suitable.
A sweet beverage drink contains sugar labeled as having 95 Calories (95kcal) of energy. how many kilojoules are there in 95.0 Calories?
Does 4 mL of 5% NaOH contain enough base to completely neutralize 125 mg of benzoic acid. Show your stoichiometry calculations.
a 0.4268 gram sample of a a potassium hydroxide-lithium hydroxidemixture requires 30.88 ml of 0.3535 m hcl for its
Use a combination of balanced chemical equations and their K's to calculate the equilibrium constant for the titration of formic acid with NaOH, which you used in the previous question. (Hint: You will need to include the value of Kw at some point..
What is the balanced reaction of sodium hydrogen carbonate + Sodium hydrogen sulphate?
Calculate the pH of a buffer solution obtained by mixing 400.0 mL of 0.200 M acetic acid solution and 100.0 mL of a 0.300 M sodium hydroxide solution.(The pKa of Acitic Acid, CH3OOH is 4.74)
Question- What bonds or attractive forces have to be broken in order for ethane to dissolve in water? Is the breaking of these bonds exo or endothermic
AgCl is a sparingly soluble salt, with a solubility of about 10-5 M in pure water. Adding KCN increases the solubility of AgCl because: CN- reacts with Ag+ to make a soluble complex.
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