userdata-paziras-Chem51-HW_06ANS

Calculateeachofthefo llowingquant it ies a numberofmo

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Unformatted text preview: Cl2 (g) + 2 KI (aq) → 2 KCl (aq) + I2 (g) oxidized: c) Li Zn reduced: 2 Cu + reduced: 2 Pb + 2 PbO (s) → 2 Pb (s) + O2 (g) oxidized: 2 O – 2 6. Calculate each of the fo llowing quant it ies: a) Number of mo les in 112 g of aspirin, C9H8O4 Molar mass = [9(12.0)+8(1.01)+4(16.0)] = 180.1 g/mol Moles = 112 g x b) 1 mol = 0.622 m ol (3 sig figs) 180.1 g Mass of 3.82 mo les of silver acetate, AgC2H3O2 Molar mass = [107.9 + 2(12.0)+3(1.01)+2(16.0)] = 166.9 g/mol Mass = 3.82 mol x c) 166.9 g = 638 g (3 sig figs) 1 m o l Number of mo lecules in 1.75 mo les o f CO2 Molar mass = 12.0 +2(16.2) = 44.0 g/mol 6.02x1023 olecules m # of CO2 mo lecules = 1.75 m ol CO x = 1.05x1024 olecules (3 sig figs) m 2 1 m ol d) Number of mo le o f H atoms in 20.0 g of CH4 Molar mass = 12.0+ 4(1.01)= 16.0 g/mol # of CH4 mo lecules = 20.0 g CH 4 x 1 m ol 4 m o H atom s x = 5.00 mol H atom s (3 sig figs) 16.0 g 1 m ol CH 4 3 7. Use the equation below to determine the mo le rat ios below: 2 CH4 + 3 O2 + 2 NH3 ® 2 HCN + 6 H2O A) 2 1 mol NH 3 = = mol H 2 O 6 3 C) mol H 2 O 6 = = 3 2 mol CH 4 B) mol HCN 2 = 3 mol O 2 D) 3 1 mol O 2 = = mol H 2 O 6 2 Use the reaction shown...
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