mole concept

The molecular formula for a carbon and hydrogen compound is C₈H₁₈. What is the empirical formula?

• C₈H₁₈

• C₉H₄

• C₁₈H₈

• C₄H₉

An empirical formula is defined as _______?

• The lowest whole number ratio of atoms in a formula.

• The actual whole number ratio of atoms in a formula.

• The formula showing the ratio of atoms in a formula.

• The formula showing the ratio of moles in a formula.

What is the molar mass of CO₂?

• 22.0 g/mol
• 28.0 g/mol
• 44.0 g/mol
• 56.0 g/mol

A mole of Neon contains
6.02 x 10²³ _____.

• atoms
• formula units
• ions
• molecules

What is the molar mass of NaCl?

• 58 g/mol

• 28 g/mol

• 12 g/mol

• 6.02 x 10²³

What is the molar mass of one molecule of Nitrogen N₂?

• 14 amu (atomic mass units)

• 14 g

• 28 g

• 28 amu

6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂

What is the total number of moles of CO₂ needed to make 2 moles of C₆H₁₂O₆?

• 2.5

• 6

• 12

• 15

Tags

NGSS.HS-PS1-7

NGSS.HS-LS2-5

A mole of carbon dioxide contains 6.02 x 10²³ _____.

• atoms
• formula units
• ions
• molecules

Identify the limiting reagent when 6.00 moles HCl combines with 5.00 moles Mg to form MgCl₂.
 
1 Mg +  2 HCl --> 1 MgCl₂  +  1 H₂   
 

• Mg
• H₂
• MgCl₂
• HCl

Tags

NGSS.HS-PS1-7

When 12 moles of O₂ reacts with 6 moles of C₁₀H₈, what is the limiting reactant?  
1 C₁₀H₈ + 12 O₂ --> 10 CO₂ + 4 H₂O

• Oxygen
• C₁₀H₈
• Water
• Carbon Dioxide

Tags

NGSS.HS-PS1-7