Final Exam Chem 2nd Part I

A chemical formula includes the symbols of the elements in the compound and subscripts that indicate

• The number of moles in each element.

• How many atoms or ions of each type are combined in the simplest unit.

• The formula mass.

How many atoms of fluorine are present in a molecule of carbon tetrafluoride, CF₄?

• 1

• 4

• 5

The formula for carbon dioxide, CO₂, can represent

• One mole of carbon dioxide molecules.

• One molar mass of carbon dioxide.

• All of the above.

One formula unit of barium chromate, BaCr0₄, represents how many chromate ions?

• 1

• 3

• 5

The formula which gives the total number of atoms of each type of element that are present in one molecule of a compound is the

• chemical kinetics.

• molecular formula. 

• formula unit.

The branch of chemistry that deals with the mass relationships of elements in compounds and the mass relationships among reactants and products in chemical reactions is known as

• qualitative analysis. 

• entropy.

• Stoichiometry.

Stoichiometry is a branch of chemistry that studies

• mass relationships developments in compounds and among reactants and products in chemical reactions.

• mechanisms of chemical reactions.

• classification of chemical reactions.

For the reaction 3Fe + 4H₂O -->  Fe₃O₄ + 4H₂, how many moles of hydrogen are produced from 9 mol of iron?

• 9 mol

• 12 mol

• 18 mol

For the reaction 2H₂ + O₂  --> 2H₂O, approximately how many grams of water are produced from 6.00 mol of hydrogen?

• 2.00 g

• 6.00 g

• 108 g

For the reaction C + 2H₂ --> CH₄, how many grams of hydrogen are required to produce 3.0 MOL of methane?

• 2 g

• 12 g

• 24 g