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A set of chemistry exam problems along with their solutions. The problems cover various topics in chemistry including molecular mass calculations, moles and mass percent, empirical and molecular formulas, balancing chemical equations, stoichiometry, and thermodynamics. The solutions demonstrate how to apply chemical concepts and equations to solve the problems.
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A. 342.30 amu C. 320.05 amu B. 160.03 amu D. 171.15 amu
A. (^) 2.34 1023 atoms C. (^) 7.33 1023 atoms B. (^) 5.81 1026 atoms D. (^) 8.2 1 1022 atoms
A. 6.49 g C. 7.07 g B. 20.4 g D. 5.24 g
HCl( aq ) + O 2 ( g ) → H 2 O( l ) + Cl 2 ( g )
Fe + 3NaBr → FeBr 3 + 3Na
A. 0.75 moles C. 0.25 moles B. 1.50 moles D. 2.25 moles
2NH 3 ( aq ) + CO 2 ( aq ) → CH 4 N 2 O( aq ) + H 2 O( l )
Starting with 50.0 g of NH 3 , how many grams of CO 2 are required for the NH 3 to be completely consumed?
A. 64.6 g C. 1.47 g B. 129 g D. 25.0 g
___Ca(OH) 2 ( aq ) + ____Na 3 PO 4 ( aq ) →
A. Ca2+( aq ) + 2OH( aq ) + 3Na+( aq ) + PO 43 ( aq ) → 3Na+( aq ) + 2OH( aq ) + CaPO 4 ( s ) B. 3Ca2+( aq ) + 2OH( aq ) + 3Na+( aq ) + 2PO 43 ( aq ) → 3Na+( aq ) + 2OH( aq ) + Ca 3 (PO 4 ) 2 ( s ) C. 3Ca2+( aq ) + 6OH( aq ) + 6Na+( aq ) + 2PO 43 ( aq ) → 6Na+( aq ) + 6OH( aq ) + Ca 3 (PO 4 ) 2 ( s ) D. 3Ca2+( aq ) + 2PO 43 ( aq ) → Ca 3 (PO 4 ) 2 ( s )
I. CuSO 4 + 2NaOH → Cu(OH) 2 + Na 2 SO 4 II. 2Al + 3MgSO 4 → 3Mg + Al 2 (SO 4 ) 3 III. 2(NH 4 ) 3 PO 4 + 3Ba(NO 3 ) 2 → Ba 3 (PO 4 ) 2 + 6NH 4 NO 3 IV. 2HNO 3 + 3H 3 AsO 3 → 2NO + 3H 3 AsO 4 + H 2 O
A. I and II C. All of them B. III and IV D. II and IV
A. (^) 8.1 102 mmHg C. 1.7 × 103 mmHg B. (^) 1.0 105 mmHg D. 2.2 mmHg
A. 0.00123 g/L C. 3.49 g/L B. 49.1 g/L D. 0.291 g/L
A. (^) 0.130 10 ^2 mol C. (^) 1.13 10 ^3 mol B. (^) 1.13 10 ^1 mol D. (^) 1.03 10 ^2 mol
A. 184.9 kJ C. 186.6 kJ B. (^) 409.9 kJ D. 722.9 kJ
KMnO 4 + HCl → KCl + MnCl 2 + H 2 O + Cl 2
CHE 105 FALL 2012 Exam 2 key