Stoichiometry Question Preview (ID: 49294)


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When this equation is balanced, using the smallest whole number coefficients, what is the coefficient for O2? ___ FeS2 + ___ O2 ___ SO2 + ___ Fe2O3
a) 2
b) 4
c) 7
d) 14

How many moles of KBrO3 are required to prepare 0.0700 moles of Br2 according to the reaction: KBrO3 + 5KBr + 6HNO3 6KNO3 + 3Br2 + 3H2O
a) 0.210 moles KBrO3
b) 0.0732 moles KBrO3
c) 0.0704 moles KBrO3
d) 0.0233 KBrO3

Which of the following statements is FALSE for the chemical equation given below in which nitrogen gas reacts with hydrogen gas to form ammonia gas assuming the reaction goes to completion? N2 + 3H2 2NH3
a) The reaction of one mole of H2 will produce 2/3 moles of NH3.
b) One mole of N2 will produce two moles of NH3.
c) One molecule of nitrogen requires three molecules of hydrogen for complete reaction.
d) The reaction of 14 g of nitrogen produces 17 g of ammonia.

CaO + 3C CaC2 + CO What is the amount of CaC2 which can theoretically be produced from the reaction of excess calcium oxide and 10.2 g of carbon?
a) 18.1 g CaC2
b) 28.4 g CaC2
c) 19.8 g CaC2
d) 20.8 g CaC2

Calculate the mass of hydrogen formed when 25 grams of aluminum reacts with excess hydrochloric acid. 2Al + 6HCl Al2Cl6 + 3H2
a) 1.4 g H2
b) 2.8 g H2
c) 0.41 g H2
d) 0.93 g H2

The limiting reagent in a chemical reaction is one that:
a) has the largest molar mass (formula weight).
b) has the smallest molar mass (formula weight).
c) is consumed completely.
d) is in excess.

If 5.0 g of each reactant were used for the the following process, the limiting reactant would be: 2KMnO4 +5Hg2Cl2 + 16HCl 10HgCl2 + 2MnCl2 + 2KCl + 8H2O
a) KMnO4
b) HCl
c) Hg2Cl2
d) Don't forget the mole ratio

. The reaction of 7.8 g benzene, C6H6, with excess HNO3 resulted in 0.90 g of H2O. What is the percentage yield? Molar Mass (g/mol): C6H6=78 HNO3=63 C6H5NO2=123 H2O=18 C6H6 + HNO3 → C6H5NO2 + H2O
a) 100%
b) 90%
c) 50%
d) 12%

Which branch of chemistry deals with the mass relationships of elements in compounds and the mass relationships among reactants and products in chemical reactions?
a) entropy
b) chemical kinetics
c) qualitative analysis
d) stoichiometry

The coefficients in a chemical equation represent the
a) relative numbers of moles of reactants and products.
b) masses, in grams, of all reactants and products.
c) number of valence electrons involved in the reaction
d) number of atoms in each compound in a reaction.

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