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Exam 3: Stoichiometry

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Question 71

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Calculate the mass of 4.50 moles of chlorine gas, Cl₂.

A) 6.34 * 10 ^-2 g
B) 4.5 g
C) 15.7 g
D) 160 g
E) 319 g

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Question 72

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Acetylene gas, HCCH(g), can be generated in the laboratory by adding calcium carbide to excess water, as shown in the following reaction CaC₂(s)+ H₂O(l) $\rarr$ HCCH(g)+ CaO(s) How many grams of CaC₂ would be required to generate 0.20 moles of HCCH(g)?

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13 g of Ca...

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Question 73

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Define a mole.

One nanogram does not seem like a very large number. How many magnesium atoms are there in 1.00 ng of magnesium?

What is the molar mass of nicotine, C₁₀H₁₄N₂?

Ferrocene, Fe(C₅H₅)₂(s), can be prepared by reacting 3.0 g of FeCl₂(s)with an equal mass of cyclopentadiene, C₅H₆(l), and an excess of KOH, as shown in the following reaction FeCl₂ + 2C₅H₆ + 2KOH $\rarr$ FeC₁₀H₁₀ + 2H₂O A. What is the limiting reagent in this procedure? B. Based on your answer to part A, what mass of Fe(C₅H₅)₂ could theoretically be formed? C. A student who carried out this reaction obtained 2.7 g of ferrocene. What was the percent yield for this reaction?

What is the theoretical yield of vanadium, in moles, that can be produced by the reaction of 2.0 mole of V₂O₅ with 6.0 mole of calcium based on the following chemical reaction? V₂O₅(s) + 5Ca(l) $\rarr$ 2V(l) + 5CaO(s)

How many O atoms are there in 51.4 g CaSO₄?

What is the average mass, in grams, of one atom of iron?

What is the mass of 0.0250 mol of P₂O₅?

When a chemical equation is balanced, it will have a set of whole number coefficients that cannot be reduced to smaller whole numbers. What is the coefficient for O₂ when the following combustion reaction of a hydrocarbon is balanced? ___ C₇H₁₄ + ___ O₂ $\rarr$ ___ CO₂ + ___ H₂O

Calculate the mass of sodium chlorate that must be decomposed to form 6.5 g of oxygen. 2NaClO₃(s) $\rarr$ 2NaCl(s)+ 3O₂(g)

Boron obtained from borax deposits in Death Valley consists of two isotopes. They are boron-10 and boron-11 with atomic masses of 10.013 amu and 11.009 amu, respectively. The atomic mass of boron is 10.81 amu (see periodic table) . Which isotope of boron is more abundant, boron-10 or boron-11?

A gold wire has a diameter of 1.00 mm. What length of this wire contains exactly 1.00 mol of gold? (density of Au = 17.0 g/cm³)

One mole of iron

How many moles of oxygen atoms are there in 10 moles of KClO₃?

One way of obtaining pure sodium carbonate is through the decomposition of the mineral trona, Na₅(CO₃) ₂(HCO₃) $\rarr$ 2H₂O, as shown in the following reaction: 2Na₃(CO₃) (HCO₃) $\rarr$ 2H₂O(s) F1F1 $\rarr$ 3Na₂CO₃(s) + CO₂(g) + 5H₂O(g) When 15 metric ton (1 * 10³ kg) of trona is decomposed, 11 metric ton of Na₂CO₃ is recovered. What is the percent yield of this reaction? (1 metric ton = 10³ kg)

How many grams of sodium are there in 10. g of sodium sulfate, Na₂SO₄?

Balance the equation below using the smallest set of whole numbers. What is the coefficient of H₂O? ___ PCl₃(l) + ___ H₂O(l) $\rarr$ ___ H₃PO₃(aq) + ___ HCl(aq)

Vanadium(V) oxide reacts with calcium according to the chemical equation below. When 10.0 moles of V₂O₅ are mixed with 10.0 moles of Ca, which is the limiting reagent? V₂O₅(s) + 5Ca(l) $\rarr$ 2V(l) + 5CaO(s)