Balancing
Find the products and balance the equation: H2 + O2 →
H2 + O2 → H2O2
Classify the following: FeCO3 + H2CO3 → Fe(HCO3)2
Synthesis/Combination
How many liters are in a mole, how many formula units?
22.4L/6.022 x 10^23 formula units
2 P + 3 Cl2 → 2 PCl3
Given: 8.7 × 1024 particles P reacted
Wanted: moles of Cl2 reacted?
22 moles Cl2
ZnO + C → Zn + CO
Given: 1.3719 moles C and 461.92 grams ZnO reacted at 78% yield
Wanted: particles of CO?
Correct answer is 6.4419 × 1023 particles CO
• C is the limiting reagent
Find the products and balance: HCl + KOH → +
HCl + KOH → H2O + KCl
Classify the following: 3 Fe(OH)2 → Fe3O4 + 2 H2O + H2
Decomposition
Is the mole an SI unit? If so what for?
Yes, substance
H2 + Br2 → 2 HBr
Given: 26.319 liters H2 reacted
Wanted: grams of Br2 reacted?
187.77 grams Br2
Fe + Cl2 → FeCl2
Given: 4.71 grams Fe and 1.677 moles Cl2 reacted at 73.7% yield
Wanted: particles of FeCl2?
Correct answer is 3.74 × 1022 particles FeCl2
• Fe is the limiting reagent
Find the products and balance: FeCl3 + NaOH → +
FeCl3 + 3 NaOH → Fe(OH)3 + 3 NaCl
Classify the following: H2SO4 + Fe → FeSO4 + H2
Single replacement
What is the percent composition of photographic “hypo,” Na2S2O3
% Na = 29.08%
% S = 40.56%
% O = 30.36%
2 Ge + O2 → 2 GeO
Given: 4.2742 moles GeO produced
Wanted: grams of Ge reacted?
310.35 grams Ge
Mg + 2 H2O → Mg(OH)2 + H2
Given: 2.0 × 1022 particles H2O and 460.55 grams Mg reacted at 54.196% yield
Wanted: moles of H2?
Correct answer is 0.0090 moles H2
• 100% yield would be 0.017 moles H2
• H2O is the limiting reagent
Find the products and balance: Cu(NO3)2 + KOH → +
Cu(NO3)2 + 2 KOH → Cu(OH)2 + 2 KNO3
Classify the following: ZnSO4 + 2 NaOH → Zn(OH)2 + Na2SO4
double replacement
Given:
Empirical formula =BH3=BH3
Molar mass =27.7g/mol=27.7g/mol
Find: Molecular formula =?
BH3×2=B2H6
ZnO + C → Zn + CO
Given: 182.41 grams CO produced
Wanted: moles of Zn produced?
6.5123 moles Zn
Mg3P2 + 6 H2O → 2 PH3 + 3 Mg(OH)2
Given: 4.6914 moles H2O and 1.8951 moles Mg3P2 reacted at 74.032% yield
Wanted: grams of PH3?
Correct answer is 39.359 grams PH3
• 100% yield would be 53.165 grams PH3
• H2O is the limiting reagent
Find the products and balance: Pb + CuSO4 → +
Pb + CuSO4 → Cu + PbSO4
Classify the following: 2 C2H5SH + 9 O2 → 4 CO2 + 6 H2O + 2 SO2
Combustion
Given:
% of Fe=69.94%
% of O=30.06%
Find: Empirical formula =Fe?O?
Fe2O3
4 NH3 + 7 O2 → 2 N2O4 + 6 H2O
Given: 4.6784 moles H2O produced
Wanted: moles of NH3 reacted?
3.1189 moles NH3
P4 + 6 Cl2 → 4 PCl3
Given: 2.4584 moles P4 and 277.77 grams Cl2 reacted at 87.238% yield
Wanted: moles of PCl3?
Correct answer is 2.2784 moles PCl3
• 100% yield would be 2.6116 moles PCl3
• Cl2 is the limiting reagent