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Exam 3: Stoichiometry: Ratios of Combination

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Question 31

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An oxide of gadolinium contains 86.76 mass % Gd. What is its empirical formula?

A) Gd₂O₃
B) Gd₃O₂
C) Gd₃O₄
D) Gd₁₃O₂
E) GdO

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Question 32

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There is only one distinct empirical formula for each compound that exists.

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Question 33

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Smooth muscle myosin is a motor protein that plays a crucial role in the contraction of smooth muscle. If this protein has a molar mass of 480,000 grams/mol, what is the mass, in grams, of 27 moles of smooth muscle myosin?

Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of one.) ________ Cr + ________ H₂SO₄ → ________ Cr₂(SO₄) ₃ + _{________} H₂

What is the coefficient of H₂O when the following equation is properly balanced with the smallest set of whole numbers? ________ Na + ________ H₂O → ________ NaOH + ________ H₂

Hydroxyl ammonium nitrate contains 29.17 mass % N, 4.20 mass % H, and 66.63 mass % O. If its molar mass is between 94 and 98 g/mol, what is its molecular formula?

If 13.9 g of oxygen react with 33.7 g of calcium to produce calcium oxide, what is the limiting reactant and what mass of calcium oxide is produced?

Phosphine, an extremely poisonous and highly reactive gas, reacts with oxygen gas to form tetraphosphorus decaoxide and water. PH₃(g) + O₂(g) → P₄O₁₀(s) + H₂O(g) [unbalanced] Calculate the mass of P₄O₁₀(s) formed when 225 g of PH₃ reacts with excess oxygen.

What mass of sodium fluoride (used in water fluoridation and the manufacture of insecticides) is required to form 485 g of sulfur tetrafluoride? 3SCl₂(l) + 4NaF(s) → SF₄(g) + S₂Cl₂(l) + 4NaCl(s)

The ________ is the amount of product physically collected from a chemical reaction and is typically less than the theoretical yield.

What is the average mass of one copper atom? (NA = 6.022 × 1023 mol^-1)

Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of one.) ________ Al + ________ H₂SO₄ → ________ Al₂(SO₄) ₃ + ________ H₂

Potassium chlorate (used in fireworks, flares, and safety matches) forms oxygen and potassium chloride when heated. KClO₃(s) → KCl(s) + O₂(g) [unbalanced] What mass of oxygen gas is formed if 26.4 g of potassium chlorate decomposes completely?

Aluminum reacts with oxygen to produce aluminum oxide which can be used as an adsorbent, desiccant or catalyst for organic reactions. A mixture of 82.49 g of aluminum and 117.65 g of oxygen is allowed to react. Identify the limiting reactant and determine the mass of the excess reactant present in the vessel when the reaction is complete.

What mass of oxygen is required to react with calcium to produce 44.8 g calcium oxide?

Phosphorus pentachloride, a white solid that has a pungent, unpleasant odor, is used as a catalyst for certain organic reactions. Calculate the number of moles in 38.7 g of phosphorus pentachloride.

Calculate the molar mass of sulfuric acid.

How many grams of water could be made from 5.0 mol H₂ and 3.0 mol O₂?

Aluminum oxide, Al₂O₃, is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators. Calculate the number of moles in 47.51 g of Al₂O₃.

How many grams of magnesium oxide remain after 18.50 g of magnesium oxide reacts with 30.30 g hydrochloric acid to produce magnesium chloride and water?