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Chemical Stoichiometry Review

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Questions and Answers

What does stoichiometry deal with in chemistry?

Physical properties of chemical compounds

Chemical bonding between atoms

The color of chemical substances

Quantitative relationship among the amounts of reacting chemical species (correct)

What is an empirical formula in chemistry?

Provides additional information about the properties of a compound

Specifies the number of atoms in a molecule

Indicates the physical state of a compound

Gives the simplest whole number ratio of atoms in a chemical compound (correct)

What is the purpose of predicting reactant quantities in stoichiometry?

To determine the types of chemical bonds present

To choose the most economical way of carrying out a reaction on a commercial scale (correct)

To measure the color change during a reaction

To interpret the results of a chemical analysis

What differentiates an empirical formula from a molecular formula?

Empirical formula specifies the number of atoms in a molecule Signup and view all the answers

What is important to establish in order to create an atomic weight scale?

A numerical value for standard element's mass Signup and view all the answers

What key concept is stoichiometry based on?

Conservation of mass Signup and view all the answers

What is the formula weight of MgCl2?

95.21 amu Signup and view all the answers

How many moles of Hydrogen gas are there in 27g of Hydrogen?

13.4 moles Signup and view all the answers

What is the empirical formula of a compound containing 60% Oxygen and 40% Sulfur by mass?

SO3 Signup and view all the answers

How many Carbon atoms are there in 0.0022 gram of CO2?

3.01 x 10^20 C atoms Signup and view all the answers

How many moles of Iron are in 0.5 gram of Iron? (Atomic weight of Fe = 55.85 amu)

1.12 moles Signup and view all the answers

What is the combining ratio in moles, according to the stoichiometry, for the reaction: 2NaI + Pb(NO3)2 -> PbI2 + 2NaNO3?

2:1:1:2 Signup and view all the answers