Unit 6 Stoichiometry Homework/Classwork

Molar Mass can be defined as _________________.

• the mass of a given substance (chemical element or chemical compound) divided by the amount of substance.
• expressed in g/mol
• Both A and B

Stoichiometry is defined as _____________________________.

• the calculation of the quantities of chemical elements or compounds involved in chemical reactions.
• ​the ratio between the amounts inmoles of any two compounds involved in a chemical reaction.
• a formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms.

Mole is defined as _________________________.

• the amount of pure substance containing the same number of chemical units as there are atoms in exactly 12 grams of carbon-12 (i.e., 6.023 X 10²³).
• the calculation of the quantities of chemical elements or compounds involved in chemical reactions.
• expressed in g/mol

Percent composition is defined as ______________________________.

• the percentage by mass of each element in a compound.
• the calculation of the quantities of chemical elements or compounds involved in chemical reactions.
• the amount of pure substance containing the same number of chemical units as there are atoms in exactly 12 grams of carbon-12 (i.e., 6.023 X 10²³).

How many grams of O₂ are in 15 moles of O₂?

• 0.468g O₂
• 480g O₂
• 240g O₂

Determine the empirical formula of a compound containing 30.4% N and 69.6%O.

• NO
• N₂O₂
• NO₂

If 5.50 mol of CaC₂ reacts with water how many moles of C₂H₂ will be produced? 
CaC₂ + 2H₂O --> Ca(OH)₂  + C₂H₂ 

• 11 mol CaC₂
• 5.50 mol CaC₂
• 26.04 g/mol CaC₂

Sodium azide decomposes in a series of reactions that inflate airbags in automobiles.  Determine the mass of N₂ produced if 100.0 g of NaN₃ is decomposed.   
Balance first: ___NaN_{3 -->}  ___Na + ___N₂

• 2.31 g N₂
• 64.64 g N₂

Photosynthesis uses carbon dioxide and water to produce glucose.  If the plant has 88 g CO₂, how many grams of glucose will be produced?   
6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂

• 79.28 g C₆H₁₂O₆
• 0.44 g C₆H₁₂O₆

Identify the molar mass of sodium chloride.

• 58.44 g/mol NaCl
• .05844 g/mol NaCl
• 814.99 g/mol NaCl