Stoichiometry Avogadro

What is the molar mass of AuCl₃?

• 96 g
• 130 g
• 232.5 g
• 303.3 g

What is the definition for Avogadro's number?

• number of grams per one mole of a substance
• whole number ratio that is a multiple of a chemical formula
• simplest, whole number ratio of a chemical formula
• 6.02 x 10^23 particles per one mole of a substance

Which would have more atoms?

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

How many moles are present in 32.3 grams of carbon dioxide (CO₂)?

• 44.01 moles
• 1421.52 moles
• 32.3 moles
• 0.73 moles

Tags

NGSS.HS-PS1-7

What is the mass in grams of 5.90 mol C₈H_18?

• .0512 g
• 19.4 g
• 673 g
• 389 g

Tags

NGSS.HS-PS1-7

How many water molecules are in 5.2 moles of water?

• 6.02 x 10²³
• 5.2
• 3.1304 x 10²⁴
• 8.638 x 10^-24

1 P₄ + 3 O₂ → 2 P₂O₃

What is the mole ratio of P₄ to O₂?

• 1:3

• 1:2

• 3:2

• 3:1

Tags

NGSS.HS-PS1-7

3 CaCl₂ + 2 Na₃PO₄ → Ca₃(PO₄)₂ + 6 NaCl

What is the mole ratio of NaCl to Ca₃(PO₄)₂?

• 1:6

• 6:1

• 2:3

• 3:2

Tags

NGSS.HS-PS1-7

4 FeS + 7 O₂ → 2 Fe₂O₃ + 4 SO₂

What is the mole ratio of iron oxide to oxygen gas?

• 4/7

• 7/4

• 2/7

• 7/2

Tags

NGSS.HS-PS1-7

A formula with the lowest whole # ratio of elements in a compound is called

• Molecular Formula
• Chemical Formula
• Empirical Formula 
• Distance Formula