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by BlastRoom
Solve multi-step stoichiometry problems from real chemical contexts.
#chemistry
18 questions
One question set, multiple game modes. Tap any game to see it in action. Not sure which to pick?
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More correct answers pulls the rope your way.
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A camping stove burns propane, C3H8, in O2 to form CO2 and H2O. If 0.500 mol propane burns, how many moles of CO2 form?
Bakery yeast ferments glucose, C6H12O6, into ethanol, C2H5OH, and CO2. If 3.00 mol glucose reacts, how many moles of ethanol form?
Scrap aluminum reacts with hydrochloric acid to make AlCl3 and H2. If 4.00 mol Al reacts completely, how many moles of H2 form?
An oxygen generator decomposes KClO3 into KCl and O2. If 0.750 mol KClO3 decomposes, how many moles of O2 form?
An air bag inflator uses 2NaN3 → 2Na + 3N2. If 65.0 g NaN3 decomposes, what mass of N2 forms? Use NaN3 = 65.02 g/mol and N2 = 28.02 g/mol.
Vinegar reacts with 8.40 g baking soda, NaHCO3, in a 1:1 mole ratio to form CO2. What mass of CO2 forms? (NaHCO3 = 84.01, CO2 = 44.01 g/mol)
Iron rusts by 4Fe + 3O2 → 2Fe2O3. If 11.2 g Fe reacts with excess O2, what mass of Fe2O3 forms? Use Fe = 55.85 g/mol and Fe2O3 = 159.69 g/mol.
In photosynthesis, 6CO2 + 6H2O → C6H12O6 + 6O2. If plants use 44.0 g CO2, what mass of glucose forms? Use CO2 = 44.01 g/mol and glucose = 180.16 g/mol.
A magnesium ribbon burns: 2Mg + O2 → 2MgO. If 12.2 g Mg burns in excess O2, what mass of MgO forms? Use Mg = 24.31 g/mol and MgO = 40.31 g/mol.
In a thermite mixture, 2Al + Fe2O3 → Al2O3 + 2Fe. A sample has 4.05 g Al and 15.96 g Fe2O3. Use Al = 26.98 g/mol and Fe2O3 = 159.69 g/mol. Which reactant limits Fe?
Rocket fuel: 2H2 + O2 → 2H2O. With 5.00 g H2 and 32.0 g O2, which limits water produced? (H2 = 2.016, O2 = 32.00 g/mol)
Silver nitrate and salt water form AgCl: AgNO3 + NaCl → AgCl + NaNO3. A test mixes 1.70 g AgNO3 and 0.400 g NaCl. Use AgNO3 = 169.87 g/mol and NaCl = 58.44 g/mol. Which reactant limits AgCl?
A fertilizer reactor runs N2 + 3H2 → 2NH3. It contains 28.0 g N2 and 3.00 g H2. Use N2 = 28.02 g/mol and H2 = 2.016 g/mol. Which reactant limits NH3?
A student heats 10.0 g CaCO3 and collects 5.00 g CaO. For CaCO3 → CaO + CO2, the theoretical yield of CaO is 5.60 g. What is the percent yield?
In an aspirin synthesis, the theoretical yield is 6.52 g aspirin, but the dried product has a mass of 5.70 g. What is the percent yield?
Iron displaces copper: Fe + CuSO4 → FeSO4 + Cu. A lab predicts 3.18 g Cu but isolates 2.72 g Cu. What is the percent yield?
A problem asks for grams of CO2 produced from liters of O2 at STP in propane combustion. Which pathway fits the calculation?
A problem asks for grams of BaSO4 from 50.0 mL of 0.200 M BaCl2 with excess Na2SO4. Which pathway is correct?
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Answer, then swat bugs for bonus points.
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Same question on every screen. Fastest wins.
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Phase Changes and Their Names
24 questions
