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Exam 3: Stoichiometry

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Question 51

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Each molecule of testosterone contains 19 atoms of carbon (plus other atoms) .The mass percent of carbon in testosterone is 79.12%.What is the molar mass of testosterone?

A) 576.8 g/mol
B) 180.5 g/mol
C) 228.2 g/mol
D) 240.1 g/mol
E) 288.4 g/mol

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Question 52

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What is the molar mass of cryolite (Na₃AlF₆) ?

A) 209.9 g/mol
B) 185.3 g/mol
C) 210.0 g/mol
D) 104.2 g/mol
E) 68.97 g/mol

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Question 53

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The molar mass of the compound formed by potassium and selenium is

How many grams of Ca(NO₃) ₂ can be produced by reacting excess HNO₃ with 6.33 g of Ca(OH) ₂?

The average mass of a carbon atom is 12.011.Assuming you were able to pick up only one carbon unit,the chances that you would randomly get one with a mass of 12.011 is

A 2.80-g sample of an oxide of bromine is converted to 4.698 g of AgBr.Calculate the empirical formula of the oxide.(molar mass for AgBr = 187.78 g/mol)

What is the coefficient for water when the following equation is balanced? As(OH) ₃(s) + H₂SO₄(aq) $\to$ As₂(SO₄) ₃(aq) + H₂O(l)

Vitamin B₁₂,cyanocobalamin,is essential for human nutrition.It's concentrated in animal tissue but not in higher plants.People who abstain completely from animal products may develop anemia,so cyanocobalamin is used in vitamin supplements.It contains 4.35% cobalt by mass.Calculate the molar mass of cyanocobalamin assuming there is one cobalt per molecule.

Given the equation 3A + B $\to$ C + D,you react 1 mole of A with 3 moles of B. True or false: A is the limiting reactant because you have fewer moles of A than B.

Which of the following compounds has the same percent composition by mass as styrene,C₈H₈?

What is the mass of a 6.761-mol sample of sodium hydroxide?

You heat 3.854 g of a mixture of Fe₃O₄ and FeO to form 4.148 g Fe₂O₃.The mass percent of FeO originally in the mixture was:

The hormone epinephrine is released in the human body during stress and increases the body's metabolic rate.Epinephrine,like many biochemical compounds,is composed of carbon,hydrogen,oxygen,and nitrogen.The percentage composition of the hormone is 59.0% C,7.15% H,26.2% O,and 7.65% N.Determine the empirical formula.

A given sample of a xenon fluoride compound contains molecules of a single type XeF_n,where n is some whole number.Given that 8.06 $\times$ 10²⁰ molecules of XeF_n weigh 0.227 g,calculate n.

How many moles of hydrogen sulfide are contained in a 49.7-g sample of this gas?

Phosphoric acid can be prepared by reaction of sulfuric acid with "phosphate rock" according to the equation: Ca₃(PO₄) ₂ + 3H₂SO₄ $\to$ 3CaSO₄ + 2H₃PO₄ How many oxygen atoms are there in 1.75 ng of Ca₃(PO₄) ₂?

The molar mass of an insecticide,dibromoethane,is 187.9 g/mol.Its molecular formula is C₂H₄Br₂.What percent by mass of bromine does dibromoethane contain?

Nitric oxide,NO,is made from the oxidation of NH₃,and the reaction is represented by the equation: 4NH₃ + 5O₂ $\to$ 4NO + 6H₂O An 8.7-g sample of NH₃ gives 12.0 g of NO.The percent yield of NO is

Ammonia can be made by reaction of water with magnesium nitride as shown by the following unbalanced equation: Mg₃N₂(s) + H₂O(l) $\to$ Mg(OH) ₂(s) + NH₃(g) If this process is 80% efficient,what mass of ammonia can be prepared from 19.0 kg magnesium nitride?

For the reaction N₂(g) + 2H₂(g) $\to$ N₂H₄(l) ,if the percent yield for this reaction is 82.0%,what is the actual mass of hydrazine (N₂H₄) produced when 25.57 g of nitrogen reacts with 4.45 g of hydrogen?