Stoichiometry

The mass of one mole of substance is called...

• molecular mass
• mole constant
• molar mass
• atomic weight

How many particles are in a mole?

• 602
• 602 million
• 602 moles
• 6.02 x 10²³

Which would have more atoms?

• 1 mole of Li
• 1 mole of Au
• 1 mole of Si
• None, all are equal

N₂ + 3H₂ --> 2NH₃
How many moles of N₂ is needed to react with 6 moles of H₂?

• 6.7
• 2.0
• 3.0
• 15.0

Where are the numbers for a mole ratio found?

• They are part of the chemical formulas for the reactants / products.

• They are given in the problem.

• They are found on the periodic table for those elements.

• They are found as coefficients in the reaction's balanced chemical equation.

The number 6.02 x 10²³ is called...

• Lewis's number

• Bohr's number

• Pauling's number

• Avogadro's number

How many particles would be in 8.4 moles of Octane (C₈H₁₈)?

• 5.77 x 10²³
• 5.04 x 10²⁴
• 5.77 x 10²⁶
• 5.04 x 10²³

2H₂ + O₂ --> 2H₂O How much O₂ is required to fully react 12 g of H₂?

• 95 g

• 12 g

• 6 g

• 48 g

Calculate the molar mass for Al(OH)₃

• 78.0 g/mol

• 72 g/mol

• 28 g/mol

• 25 g/mol

Calculate the molar mass of NH₄NO₂

• 50 g/mol

• 60 g/mol

• 64 g/mol

• 78 g/mol