Chem 101 Final Exam Questions And Answers 100% Solved
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Course
Chem 101
Institution
Chem 101
Chem 101 Final Exam Questions And
Answers 100% Solved
Determine the formula weight of KBr - answer119.00 amu
Determine the mass in grams of 3.00 x 10^21 atoms of arsenic. (The mass of one mole of arsenic
is 74.92 g.) - answer0.373 g
Fill in the blank: A mole is defined as the number of carbon ...
Chem 101 Final Exam Q uestions And Answers 100% Solved Determine the formula weight of KBr - answer✔✔119.00 amu Determine the mass in grams of 3.00 x 10^21 atoms of arsenic. (The mass of one mole of arsenic is 74.92 g.) - answer✔✔0.373 g Fill in the blank: A mole is defined as the number of carbon atoms in _____ g of pure ^12C. - answer✔✔12 How many atoms are in 1.2 mol of carbon? - answer✔✔7.2264 x 10^23 Which one of the following contains the most moles of oxygen atoms? A) 1 mol o f Fe(C2H3O2)3 B) 1 mol of Na3PO4 C) 2 mols of Ca(NO2)2 D) 3 mol of CH3OH - answer✔✔C) 2 mols of Ca(NO2)2 Determine the molar mass of CH3OH. - answer✔✔32.04 g/mol Determine the number of atoms of O in 92.3 moles of Cr3(PO4)2 - answer✔✔4.45 x 10^26 atoms How many atoms of vanadium are in 1.28 grams of vanadium? - answer✔✔1.51 x 10^22 atoms of V What is the molecular formula of a compound that contains only carbon and hydrogen, is 85.6% carbon, and has a molar mass of 70g/mol? A) CH2 B) C5H10 C) C5H5 D) C4H 21 - answer✔✔B) C5H10 A compound that contains only carbon, hydrogen, and oxygen is 58.8% C and 9.87% H by mass. What is the empirical formula of this substance? A) C2*5H50 B) C5H10O2 C) C6H4O D) C4H8O2 E) C5H5O2 - answer✔✔B) C5H10O2 What is the mass perce ntage of Cl in hydrochlorothiazide, C7H8ClN3O4S2? - answer✔✔11.91 % What is the mass percentage of C in morphine, C17H19NO3? - answer✔✔71.56 % An iron -containing compound is 20.1% Fe, 11.5% S, 63.3% O, and 5.1% H. What is the empirical formula for this com pound? A) Fe3SO19H25 B) Fe15S9O50H C) FeS2O22H28 D) FeSO11H14 - answer✔✔D) FeSO11H14 100.0 mL of a 0.500 M solution of KBr is diluted to 500.0 mL. What is the new concentration of the solution? - answer✔✔0.100 M How many mL of 0.300 M NaCl solution are req uired to produce 0.150 moles of NaCl? - answer✔✔500 mL How many moles of CH3OH are there in 50.0 mL of 0.400 M CH3OH? - answer✔✔0.0200 mol To what volume would you need to dilute 20.0 mL of a 1.40 M solution of LiCN to make a 0.900 M solution of LiCN? - answer✔✔311 mL If 50.0 g of CH3OH (MM=32.04 g/mol) are dissolved in 500.0 mL of solvent, what is the concentration of CH3OH in the resulting solution? - answer✔✔3.12 M What is the empirical formula for methamphetamine? A) C10H15N B) C10H12N C) C9H15N D) C10H14N E) Cannot be determined. - answer✔✔A) C10H15N
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