how many moles (of molecules or formula units) are in each sample?express your answer to four sig figs54.69g CF2CL226.6 kg Fe(NO3)2159kgCaO I Review I C54.69 g CF2C12Express your answer to four significant figures.IX|X•10n- 201.16 10NCF, Cl, =molSubmitPrevious Answers Request AnswerX Incorrect; Try Again; 4 attempts remainingPart B26.6 kg Fe (NO3) 2Express your answer to three significant figures.να ΑΣφmolNFe(NO)圓18 SubmitRequest AnswerPart D159 kg CaoExpress your answer to three significant figures.undonCaOSubmitRequest Answerrovide FeedbackP Pearson

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Chemistry In Focus

7th Edition

ISBN:9781337399692

Author:Tro, Nivaldo J.

Publisher:Tro, Nivaldo J.

Chapter2: The Chemist’s Toolbox

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Problem 3E

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The combustion of ammonia in the presence of excess oxygen yields NO2 and H20: 4 NH3 (g) + 7 02 (g) -4 NŐ2 (g) + 6 H20 (g) The combustion of 263 g of ammonia consumes g of oxygen. Atomic weights: N=14.01, H=1.01, O-15.99. Input values only with 2 decimal places.
Orciprenaline(C11H17N03,211.258 g/mol) is a bronchodilatorused in the treatment of asthma.The BP assay for orciprenalinetablets is described below. Read thefollowing information carefully andanswer the questions below.(Record your answers in decimalnotation to the indicated significantfigures OR decimal places)ASSAY - 20 tablets weighing 2.597 gwere crushed to a powder. Aportion of the crushed powder(0.5456 g) was shaken with 50 mL of0.1 M HI, the mixture was filteredand made up to 100 mL. 10 mL ofthis solution was further diluted to100 mL with 0.1 M HCI. Themeasured absorbance of thediluted solution at 276 nm was0.582. Additional information: A1%72.3, stated content = 20 mg Calculate:a) The concentration oforciprenaline in the diluted solutionin mg/L b) The actual amount oforciprenaline (in mg) in the powderassayed.c) The actual amount oforciprenaline (in mg) per tablet.d) The percentage of stated contentof per tablet.
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Pavilion HP TrueVision HD 4 Texas Workfor Mc Homework X W. College Physic hnical App AN Careers J/eagleonline.hccs.edu/courses/188795/assignments/3601808 Avaliabie diler reD 4 dl 10.17 dim Constants | Periodic Table Compiete tne fourtn row. Express your answer using two significant figures. Complete the following table by calculating the missing entries and indicating whether the solution is acidic or basic. [H+] [OH]] pH pOH Acidic or basic? ΑΣφ 7.4x10-3 [H*] 3.3x10-10 M Submit Request Answer 8.25 5.73 DOL ADVANCEDA fo f2. ho 4+ Is 10 insert
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320.5 (6107.5/2.1) Express your answer to the appropriate number of significant figures.
Part B 124 g of 0.200 m NaNO3 Express your answer to three significant figures. ► View Available Hint(s) msolute = Submit VE ΑΣΦ Previous Answers C ? g NaNO3
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What is number 5?
3 2 1 5. 1Н + 1Н — On+. -- 4Be 4 O 2He 2Не 3 Ön 1H
Part B O2 (8) + 2H20 (1) + 2Cu (s)+40H (aq) +2Cu²* (aq) Express your answer using two significant figures. K- 8.3 • 1016 Submit Previous Answere Request Answer X Incorrect; Try Again; 4 attempts remaining • Part C Bra (1) + 21 (aq)→2Br (aq) + I2 (s) Express your answer using two significant figures. K-1.73 • 10 51

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how many moles (of molecules or formula units) are in each sample? express your answer to four sig figs 54.69g CF2CL2 26.6 kg Fe(NO3)2 159kgCaO