QUESTION 15 A compound of the empirical formula CH₂O is found to have a molar mass of 120 amu. What is the molecular formula? OA C₂H402 OB. C3H303 OCC4H804 OD.C6H1206 OE not enough information QUESTION 16 How many atoms of chromium are in 6.18g of K2Cr207 (MW 294.19)? Give the answer in scientific notation, to the correct number of significant figures, eg. 4.25e22 MacBook Air

QUESTION 15 A compound of the empirical formula CH₂O is found to have a molar mass of 120 amu. What is the molecular formula? OA C₂H402 OB. C3H303 OCC4H804 OD.C6H1206 OE not enough information QUESTION 16 How many atoms of chromium are in 6.18g of K2Cr207 (MW 294.19)? Give the answer in scientific notation, to the correct number of significant figures, eg. 4.25e22 MacBook Air

Introductory Chemistry: A Foundation

9th Edition

ISBN:9781337399425

Author:Steven S. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Donald J. DeCoste

Chapter8: Chemical Composition

Section: Chapter Questions

Problem 83AP: Use the periodic table shown in Fig. 4.9 to determine the atomic mass (per mole) or molar mass of...

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How many atoms of sulfur are in 437 g of Na₂S₂O₃ ? Atomic weights: Na=22.99, S=32.07, O=15.99. Input values only in scientific notation with 2 decimal places, e.g., if the answer is 3.52x1023 input 3.52e23 , if 3.52x10-23 input 3.52e-23.
Ch 5 and 6 chem 107 help. could you go step by step in some . others just need help anyway. thank you 1a to 20a questions are in the photos, 1b to 18b are after this text. Im sorry they are hard to see i tried all i had. please help i have a test and even more work for 2 more chapters in 2 days and need this done and to actually understand it. 1b.How many moles of Cu are in 1.48 × 1025 Cu atoms? A. 0.0408 B. 24.6 C. 1.54 × 1025 D. 6.022 × 1023 E. none of the above 2b.How many moles of O are there in 12.4 mol Fe(NO3)3? A. 12.4 B. 37.2 C. 4.13 D. 112 E. none of the above 3b.How many moles of sulfate ions are contained in 0.420 moles of aluminum sulfate? A. 0.140 moles B. 1.26 moles C. 0.840 moles D. 0.420 moles 4b.Sucrose, C12H22O11, is the common table sugar. If 1.054 g of sucrose are added to a cup of tea how many molecules of sucrose will be in the cup?…
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