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[1] A 27.0 gram sample of an unknown hydrocarbon is burned in exess oxygen to form 88.0 grams of carbon dioxide and 27.0 grams of water. What is a possible molecular formula of the hydrocarbon? a. CH4 b. C2H2 c. C4H3 d. C4H6 e. C4H10 [2] The alkenes are compounds of carbon and hydrogen with the general formula CnH2n. If 0.561 grams of any alkene is burned in excess oxygen, what number of moles of H2O is formed? a. 0.0400 mole b. 0.0600 mole c. 0.0800 mole d. 0.400 mole e. 0.800 mole [3] A sample of 9.00 grams of aluminum metal is added to an excess of HCl. The volume of hydrogen gas produced at STP is a. 22.4 L b. 11.2 L c. 7.46 L d. 5.60 L e. 3.74 L [4] Which molecule exhibits sp3d2 hybridization? a. SO2 b. SF6 c. CH4 d. PCl5 [5] When carbon undergoes sp2 hybridization, it forms a. Four sigma bonds b. Three sigma bonds and one pi bond c. Two sigma bonds and two pi bonds d. One sigma bond and three pi bonds e. Four pi bonds [6] Which molecule has triangular bipyramid geometry? a. PF5 b. H2O c. SF6 d. PCl3 [7] The approximate OSO angle in the SO2 molecules is: a. 90 degrees b. 109 degrees c. 120 degrees d. 180 degrees
A scientist wants to make a solution of tribasic sodium phosphate, Na_3PO_4, for a laboratory experiment. How many grams of Na_3PO_4 will be needed to produce 350 mL of a solution that has a concentration of Na^+ ions of 1.20M
You titrated 1.740g of a solid unknown acid that wasdissolved in 100.0 mL of distilled water; the initial pH value was 2.5. You found that pH= pKa =4.2 when 12.50 mL of NaOH had been added. The concentration of the sodium hydroxide was 0.500M. Cal..
Given that the initial rate constant is 0.0190s^-1 at an initial temperature of 28 degrees celsius what would the rate constant be at a temperature of 150 degrees celsius for the same reaction descrabed in part A?
Descrbe the pH of a buffer soluton consisting of 100mL containing 0.1M CH3COOH and 0.125 CH3COO-, both before and after the additon
Two samples of sodium chloride were decomposed into their constituent elements. One sample produced 2.84 g of sodium and 4.37 g of chlorine
What dansylated amino acids would be isolated after reaction of S-F-H-Y-W-C-T-L-C-K-L-I-N-D-S with dansyl chloride an the complete with hydrolysis
calculate the potential of a platinum electrode immersed in a solution that is prepared by mixing 25 ml of 0.0832 M V2(SO4)3
Find out the required pressure to compress 180 liters of N at 1.0 atm into a tank whose volume is 34 liters.
Typically, the concentration of hydronium, H+, or hydroxide,OH- , ions in an aqueous solution is less than 1M . It is not uncommon to have hydronium ion concentrations that are much smaller
Determine the equilibrium partial pressure of NH3 in a reaction vessel that initially contained 0.900 atm N2 and 0.500 atm H2 at 648K.
determine the throat diameter of a Venturi meter which would measure a flow of 0.4 m3/s in a pipe of 0.6m diameter with a differential head of 0.8
isooctane a fuel used in gasoline engines because it has an antiknock octane rating of 100 has a density of 0.6919 g
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