A C 2 SH 4 B C 2 SH 2 C CSH D C 4 SH 2 E C 2 S 2 H 4 This review was not

A c 2 sh 4 b c 2 sh 2 c csh d c 4 sh 2 e c 2 s 2 h 4

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A) C 2 SH 4 B) C 2 SH 2 C) CSH D) C 4 SH 2 E) C 2 S 2 H 4 * This review was not prepared by your professor or school and is neither approved nor endorsed by your college or university 11
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ECU - GENERAL CHEMISTRY I - PROF. SPUCHES ECU CHEM 1150 SPUCHES EXAM 2 REVIEW* PRACTICE: Combustion analysis of 2.400 g of an unknown compound containing carbon, hydrogen, and oxygen produced 4.171 g of CO 2 and 2.268 g of H 2 O. What is the empirical formula of the compound? A) C 2 H 5 O 2 B) C 2 H 5 O C) C 2 H 10 O 3 D) C 3 H 8 O 2 SUMMARY: Mass Percent Formula * This review was not prepared by your professor or school and is neither approved nor endorsed by your college or university 12
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ECU - GENERAL CHEMISTRY I - PROF. SPUCHES ECU CHEM 1150 SPUCHES EXAM 2 REVIEW* PRACTICE: Calculate the following: Mass % of O in sodium dihydrogen phosphate heptahydrate. PRACTICE: A solution was prepared by dissolving 39.0 g of KCl in 225 mL of water. Calculate the mass percent of KCl in the solution. PRACTICE: Calculate the mass percent of iodine in strontium iodate a. 58% b. 29% c. 41% d. 48% e. 67% * This review was not prepared by your professor or school and is neither approved nor endorsed by your college or university 13
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ECU - GENERAL CHEMISTRY I - PROF. SPUCHES ECU CHEM 1150 SPUCHES EXAM 2 REVIEW* PRACTICE: A crystalline sample that has the formula MgCl 2 .6H 2 O loses a portion of its water when it is dried in an oven for several hours but undergoes no other changes. If the student, Dora the Explorer, started with 10.000 g of the compound and ended up with a residue that weighed 7.342 g., what is the formula of the residue? a) MgCl 2 .H 2 O b) MgCl 2 .2H 2 O c) MgCl 2 .3H 2 O d) MgCl 2 .4H 2 O e) MgCl 2 .5H 2 O PRACTICE: What mass of NaCl is contained in 24.88 g of a 15.00% by mass solution of NaCl in water? A. 20.00 g B. 21.15 g C. 3.73 g D. 1.50 g E. 12.44 g * This review was not prepared by your professor or school and is neither approved nor endorsed by your college or university 14
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ECU - GENERAL CHEMISTRY I - PROF. SPUCHES ECU CHEM 1150 SPUCHES EXAM 2 REVIEW* PRACTICE: Aluminum metal reacts with iron(II) sulfide to form aluminum sulfide and iron metal. What is the stoichiometric coefficient for aluminum when the chemical equation is balanced using the lowest, whole-number stoichiometric coefficients? a. 1 b. 2 c. 3 d. 4 PRACTICE: Balance the following equations by inserting coefficients as needed. a. CaCO 3 + HCl CaCl 2 + CO 2 + H 2 O b. C 6 H 12 O 2 + O 2 CO 2 + H 2 O * This review was not prepared by your professor or school and is neither approved nor endorsed by your college or university 15
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ECU - GENERAL CHEMISTRY I - PROF. SPUCHES ECU CHEM 1150 SPUCHES EXAM 2 REVIEW* PRACTICE: A reaction occurs between calcium nitrate and ammonium fluoride, producing calcium fluoride, dinitrogen monoxide, and water vapor. The correct set of stoichiometric coefficients, respectively, for the balanced reaction is: A) 3 6 6 3 4 B) 3 2 1 2 2 C) 1 2 2 1 1 D) 1 2 1 2 4 E) 2 1 2 2 2 PRACTICE: Write the balanced chemical equation: Aqueous hydrochloric acid reacts with solid manganese(IV) oxide to form aqueous manganese(II) chloride, liquid water, and chlorine gas.
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