Stoichiometry

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2H₂ + O₂ → 2H₂O How many moles of oxygen are needed if 8 moles H₂ are used?

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4

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For the Balanced Reaction: 3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe; What is the Ratio of moles of MgO to moles Fe?

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3 mol MgO : 2 mol Fe

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2 KClO₃ → 2 KCl + 3 O₂
How many moles of oxygen are produced when 6.7 moles of KClO₃ decompose completely?

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10.1 mol

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2Na + 2H₂O → 2NaOH+ H₂. How many grams of hydrogen are produced if 120 g of Na are available? M(Na)= 23 g.mol^-1, M (H) = 1 g.mol^-1.

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5.22 g

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Cl₂ + 2 KBr → Br₂ + 2 KCl How many grams of potassium chloride can be produced from 356 g of chlorine? M(Cl)= 35.5 g.mol^-1 M(K)= 39 g.mol^-1

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223 g

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CH₄ + 2 O₂ → CO₂ + 2 H₂O. How many moles of carbon dioxide are produced from the combustion of 110 g of CH₄? M(C)= 12 g.mol^-1 M(H) = 1 gmol^-1

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6.88 mol

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12.00 moles of NaClO₃ will produce how many grams of O₂?

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576 g of O₂

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B₂H₆ + 3O₂ --> 2 HBO₂ + 2 H₂O. What mass of O₂ is needed to burn 36.1 g of B₂H₆? M(O)= 16 g.mol^-1, M(B)= 11 g.mol^-1, M(H) = 1 gmol^-1. Options: 13.8 g O₂, 3.86 mol of O₂, 124 g O₂.

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124 g O₂

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CH₄   +   4 Cl₂   →   CCl₄  +  4 HCl If 437 g of HCl is produced, how many moles of HCl were there?

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12

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When do we use the coefficients in front of compounds in the reaction CH₄ + 4 Cl₂ → CCl₄ + 4 HCl?

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When determining the number of moles of unknown compounds by comparing ratios.