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5 cards from this section. Quick, good the night before a test.
How many moles are there in 36.0 g of water, H₂O? (H = 1.0, O = 16.0)
Use n = m ÷ M.
What is the mass of 0.500 mol of carbon dioxide, CO₂? (C = 12.0, O = 16.0)
Rearrange n = m ÷ M to m = n × M.
Which quantity do you usually calculate first when solving a stoichiometry problem?
Which quantity do the coefficients of an equation describe?
In N₂ + 3H₂ → 2NH₃, how many moles of ammonia form from 6 mol of hydrogen gas?
Multiply by the coefficient you want and divide by the coefficient you have.
In respiration, glucose reacts with oxygen: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O. What mass of carbon dioxide is produced when 10.0 g of glucose is completely oxidised? (C = 12.0, H = 1.0, O = 16.0)
One molecule of glucose contains six carbon atoms, so it gives six molecules of CO₂.
Baking soda (sodium hydrogencarbonate) decomposes when heated: 2NaHCO₃ → Na₂CO₃ + H₂O + CO₂. Starting with 16.8 g of NaHCO₃, find (a) the volume of carbon dioxide at STP and (b) the mass of sodium carbonate formed. (Na = 23.0, H = 1.0, C = 12.0, O = 16.0; molar volume at STP = 22.7 dm³ mol⁻¹)
Two moles of NaHCO₃ give only one mole of each product.
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