Chapter 4 Pretest Questions many grams of dioxygen are required to completely bu

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Chapter 4 Pretest Questions many grams of dioxygen are required to completely burn 3.4 gof CaHsoH? a. 8.2g b. 11g c.2.3g d.38g e.sig 15. How many grams of dioxygen 17. Nitric oxide is made from the oxidation of ammonia. g NHs with 17.0 g 02? 4NH3(g) + 502(g) 4 NOR) + 6 H20(g) What mass of nitric oxide can be made from the reaction of 8.00 a. 4.54g b. 128g c.14.1g d. 15.9g e.25.0g 19. Hydrogen peroxide decomposes 125 g of H202? into oxygen and water. What mass of oxygen is formed from the decomposition of a. 58.8g b. 66.4g c. 107g d. 118g e. 125 g 21. What is the pH of 2.9 x 10- M HC(a)? c.3.5d.1.01 a.-1.01 b, 2.54 e, 5.65 23. One step in the isolation of pure rhodium metal (Rh) is the precipitation of shodium(II) bydroxide from a solution containing rhodium(III) sulfate according to the following balanced chemical equation: Ir 8.40 g of rhodium(lID) sulfate reacts with excess sodium hydroxide, what mass of rhodium(II) hydroxide may be produced? a. 5.23 g b. 16.8g c. 8.4g d.13g e. 10.4g 25. Calibration of a spectrophotmeter using a series of green dye containing solutions provides a set of data which follows x-axis molar concentration). What is the Beer-Lambert Law, with a trendine of y - 1.437 - 10'kx (-anis - absorbance, xaxis - molar concentration), Whatis of a solution with an absorbance of 0.84252 b. 0.8425M the molar c.1.187 M d. 0.6959 M a. 0.5863 M e. 0.1575 27. The pH of an aqueous NaOH solution is 12.83. What is the hydrogen ion concentration of this solution? a. 1.5 * 10-3 M b. 6.7 102 M c. 12 M d. 6.7x 102 M e. 2.7 10*M

Explanation / Answer

15) The Correct answer is 7.08 But No option

C2H5OH + 3 O2 = 2 CO2 + 3 H2O

17 ) b) 12.8g

19) a) 58.8

2 H2O2 = O2 + 2 H2O

21) b ) 2.54

pH = -Log (2.9x 10-3)

23) a) 5.23

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