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eng-fall07-q8059x04

eng-fall07-q8059x04 - Problem 3.21a 2(2 pts Determine the...

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CHEM 2045C: Quiz 4 NAME ___________________________ N #_____________ Show your work for full credit Eng Q8059x04 continued Potentially helpful information The periodic table is on the last sheet. 1 in = 2.54 cm (exactly) 1 lb = 453.59 g 1 L = 1.0567 qt 1 amu = 1.66053873 × 10 -24 g e = 1.60217653×10 -19 C ° C = 5 / 9 ( F – 32) K = C + 273.15 Avogadro’s # = 6.0221421×10 23 As always, show your work, follow significant figure rules and box your answers for full credit. 1. (4 pts) Determine in g/mol the formula weight or molecular weight – as appropriate – for the following: A. iron (III) sulfate Problem 3.21f. B. dinitrogen pentoxide
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Unformatted text preview: Problem 3.21a. 2. (2 pts) Determine the percentage by mass of oxygen in sodium sulfate. Problem 3.23d. CHEM 2045C: Quiz 4 Eng Q8059x04 Show your work for full credit THE END 3. (3 pts) For the following reaction, how many moles of hydrofluoric acid are needed to react with 0.310 mol of Na 2 SiO 3 ? Na 2 SiO 3 (s) + 8 HF (aq) H 2 SiF 6 (aq) + 2 NaF (aq) + 3 H 2 O (l) modified Problem 3.57a. 4. (6 pts) Give the empirical and molecular formula for a compound that contains 40.0% C, 6.7% H, and 53.3% O by mass. The molecular weight of the compound is 90.1 g/mol. modified Problem 3.43c....
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eng-fall07-q8059x04 - Problem 3.21a 2(2 pts Determine the...

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